Bump js-yaml from 3.14.1 to 4.1.1 in /llvm/utils/vscode/llvm

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.14.1 to 4.1.1.
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](nodeca/js-yaml@3.14.1...4.1.1)

---
updated-dependencies:
- dependency-name: js-yaml
  dependency-version: 4.1.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]

llvm/utils/vscode/llvm/package-lock.json

@@ -110,7 +110,7 @@
     "devDependencies": {
         "@types/node": "^8.10.59",
         "@types/vscode": "^1.39.0",
-        "js-yaml": "^3.13.1",
+        "js-yaml": "^4.1.1",
         "tslint": "^5.16.0",
         "typescript": "^3.8.3"
     },