Bump js-yaml from 4.2.0 to 5.1.0

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 4.2.0 to 5.1.0.
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](nodeca/js-yaml@4.2.0...5.1.0)

---
updated-dependencies:
- dependency-name: js-yaml
  dependency-version: 5.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -16,7 +16,7 @@
     "@ts-common/source-map": "0.5.0",
     "@ts-common/string-map": "0.3.0",
     "autorest": "^3.8.0",
-    "js-yaml": "^4.1.0",
+    "js-yaml": "^5.1.0",
     "json-pointer": "0.6.2",
     "json-refs": "^3.0.15",
     "lodash": "^4.17.21",