Bump gulp-sourcemaps from 2.6.5 to 3.0.0 in /extensions/ql-vscode

Bumps [gulp-sourcemaps](https://github.com/gulp-sourcemaps/gulp-sourcemaps) from 2.6.5 to 3.0.0.
- [Release notes](https://github.com/gulp-sourcemaps/gulp-sourcemaps/releases)
- [Commits](gulp-sourcemaps/gulp-sourcemaps@v2.6.5...v3.0.0)

---
updated-dependencies:
- dependency-name: gulp-sourcemaps
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

extensions/ql-vscode/package-lock.json

@@ -1190,7 +1190,7 @@
     "glob": "^7.1.4",
     "gulp": "^4.0.2",
     "gulp-replace": "^1.1.3",
-    "gulp-sourcemaps": "^2.6.5",
+    "gulp-sourcemaps": "^3.0.0",
     "gulp-typescript": "^5.0.1",
     "husky": "~4.2.5",
     "jsonc-parser": "^2.3.0",