Change references to master branch to main branch

I have already pushed `main` upstream pointing at the same commit as
master, so this PR should be safe to merge. To the best of my
knowledge all that's necessary after that is to change the
default branch
in https://github.com/github/vscode-codeql/settings/branches.

.github/ISSUE_TEMPLATE/new-extension-release.md

@@ -9,7 +9,7 @@ assignees: ''
 ---
 
 - [ ] Update this issue title to refer to the version of the release
-- [ ] Trigger a release build on Actions by adding a new tag on master of the format `vxx.xx.xx`
+- [ ] Trigger a release build on Actions by adding a new tag on branch `main` of the format `vxx.xx.xx`
 - [ ] Monitor the status of the release build in the `Release` workflow in the Actions tab.
 - [ ] Download the VSIX from the draft GitHub release that is created when the release build finishes.
 - [ ] Log into the [Visual Studio Marketplace](https://marketplace.visualstudio.com/manage/publishers/github).

.github/pull_request_template.md

@@ -1,12 +1,12 @@
 <!-- Thank you for submitting a pull request. Please read our pull request guidelines before
   submitting your pull request:
-  https://github.com/github/vscode-codeql/blob/master/CONTRIBUTING.md#submitting-a-pull-request.
+  https://github.com/github/vscode-codeql/blob/main/CONTRIBUTING.md#submitting-a-pull-request.
 -->
 
 Replace this with a description of the changes your pull request makes.
 
 ## Checklist
 
-- [ ] [CHANGELOG.md](https://github.com/github/vscode-codeql/blob/master/extensions/ql-vscode/CHANGELOG.md) has been updated to incorporate all user visible changes made by this pull request.
+- [ ] [CHANGELOG.md](https://github.com/github/vscode-codeql/blob/main/extensions/ql-vscode/CHANGELOG.md) has been updated to incorporate all user visible changes made by this pull request.
 - [ ] Issues have been created for any UI or other user-facing changes made by this pull request.
 - [ ] `@github/product-docs-dsp` has been cc'd in all issues for UI or other user-facing changes made by this pull request.

.github/workflows/release.yml

@@ -93,12 +93,12 @@ jobs:
           asset_name: ${{ format('vscode-codeql-{0}.vsix', steps.prepare-artifacts.outputs.ref_name) }}
           asset_content_type: application/zip
 
-      # The checkout action does not fetch the master branch.
-      # Fetch the master branch so that we can base the version bump PR against master.
-      - name: Fetch master branch
+      # The checkout action does not fetch the main branch.
+      # Fetch the main branch so that we can base the version bump PR against main.
+      - name: Fetch main branch
         run: |
-          git fetch --depth=1 origin master:master
-          git checkout master
+          git fetch --depth=1 origin main:main
+          git checkout main
 
       - name: Bump patch version
         id: bump-patch-version
@@ -119,4 +119,4 @@ jobs:
           title: Bump version to ${{ steps.bump-patch-version.outputs.next_version }}
           body: This PR was automatically generated by the GitHub Actions release workflow in this repository.
           branch: ${{ format('version/bump-to-{0}', steps.bump-patch-version.outputs.next_version) }}
-          base: master
+          base: main

CONTRIBUTING.md

@@ -149,7 +149,7 @@ Alternatively, you can run the tests inside of vscode. There are several vscode
 1. Double-check that the extension `package.json` has the version you intend to release.
    If you are doing a patch release (as opposed to minor or major version) this should already
    be correct.
-1. Trigger a release build on Actions by adding a new tag on master of the format `vxx.xx.xx`
+1. Trigger a release build on Actions by adding a new tag on branch `main` of the format `vxx.xx.xx`
 1. Monitor the status of the release build in the `Release` workflow in the Actions tab.
 1. Download the VSIX from the draft GitHub release at the top of [the releases page](https://github.com/github/vscode-codeql/releases) that is created when the release build finishes.
 1. Optionally unzip the `.vsix` and inspect its `package.json` to make sure the version is what you expect,

README.md

@@ -4,7 +4,7 @@ This project is an extension for Visual Studio Code that adds rich language supp
 
 The extension is released. You can download it from the [Visual Studio Marketplace](https://marketplace.visualstudio.com/items?itemName=github.vscode-codeql).
 
-To see what has changed in the last few versions of the extension, see the [Changelog](https://github.com/github/vscode-codeql/blob/master/extensions/ql-vscode/CHANGELOG.md).
+To see what has changed in the last few versions of the extension, see the [Changelog](https://github.com/github/vscode-codeql/blob/main/extensions/ql-vscode/CHANGELOG.md).
 
 [![CI status badge](https://github.com/github/vscode-codeql/workflows/Build%20Extension/badge.svg)](https://github.com/github/vscode-codeql/actions?query=workflow%3A%22Build+Extension%22+branch%3Amaster)
 [![VS Marketplace badge](https://vsmarketplacebadge.apphb.com/version/github.vscode-codeql.svg)](https://marketplace.visualstudio.com/items?itemName=github.vscode-codeql)

extensions/ql-vscode/README.md

@@ -7,7 +7,7 @@ This project is an extension for Visual Studio Code that adds rich language supp
 - Provides an easy way to run queries from the large, open source repository of [CodeQL security queries](https://github.com/github/codeql).
 - Adds IntelliSense to support you writing and editing your own CodeQL query and library files.
 
-To see what has changed in the last few versions of the extension, see the [Changelog](https://github.com/github/vscode-codeql/blob/master/extensions/ql-vscode/CHANGELOG.md).
+To see what has changed in the last few versions of the extension, see the [Changelog](https://github.com/github/vscode-codeql/blob/main/extensions/ql-vscode/CHANGELOG.md).
 
 ## Quick start overview