dependabot.yml: Add exclude-paths option to gomod config

.github/dependabot.yml

@@ -25,18 +25,11 @@ updates:
     allow:
       - dependency-name: "golang.org/x/mod"
       - dependency-name: "golang.org/x/tools"
+    exclude-paths:
+      - "go/ql/**"
     groups:
       extractor-dependencies:
         patterns:
           - "golang.org/x/*"
     reviewers:
       - "github/codeql-go"
-
-  - package-ecosystem: "gomod"
-    directory: "go/ql/test"
-    schedule:
-      interval: "monthly"
-    ignore:
-      - dependency-name: "*"
-    reviewers:
-      - "github/codeql-go"