Remove extension dependency on semmle-bqrs

extensions/ql-vscode/package.json

@@ -600,7 +600,6 @@
     "node-fetch": "~2.6.0",
     "react": "^16.8.6",
     "react-dom": "^16.8.6",
-    "semmle-bqrs": "^0.0.1",
     "semmle-io-node": "^0.0.1",
     "@github/codeql-vscode-utils": "^0.0.4",
     "tmp": "^0.1.0",