Bump eslint from 7.30.0 to 7.31.0 in /src/vscode-bicep (#3684)

Bumps [eslint](https://github.com/eslint/eslint) from 7.30.0 to 7.31.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v7.30.0...v7.31.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/vscode-bicep/package-lock.json

@@ -212,7 +212,7 @@
     "@typescript-eslint/parser": "^4.28.4",
     "copy-webpack-plugin": "^9.0.1",
     "esbuild-loader": "^2.13.1",
-    "eslint": "^7.30.0",
+    "eslint": "^7.31.0",
     "eslint-config-prettier": "^8.3.0",
     "eslint-plugin-header": "^3.1.1",
     "eslint-plugin-jest": "^24.3.6",