Bump mocha from 8.3.2 to 8.4.0 (#3341)

Bumps [mocha](https://github.com/mochajs/mocha) from 8.3.2 to 8.4.0.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v8.3.2...v8.4.0)

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

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

Author: dependabot[bot]

package-lock.json

@@ -64,7 +64,7 @@
     "@types/sinon": "~10.0.0",
     "@types/uuid": "~8.3.0",
     "@types/vscode": "~1.52.0",
-    "mocha": "~8.3.2",
+    "mocha": "~8.4.0",
     "mocha-junit-reporter": "~2.0.0",
     "mocha-multi-reporters": "~1.5.1",
     "mock-fs": "~4.14.0",