Bump js-yaml from 3.14.1 to 4.0.0

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.14.1 to 4.0.0.
- [Release notes](https://github.com/nodeca/js-yaml/releases)
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](nodeca/js-yaml@3.14.1...4.0.0)

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

package.json

@@ -109,7 +109,7 @@
  "chalk": "^4.1.0",
  "escape-string-regexp": "^4.0.0",
  "graceful-fs": "^4.2.4",
- "js-yaml": "^3.14.1",
+ "js-yaml": "^4.0.0",
  "libnpmconfig": "^1.2.1",
  "lockfile": "^1.0.4",
  "mkdirp": "^1.0.4",