Bump js-yaml and @types/js-yaml

Bumps [js-yaml](https://github.com/nodeca/js-yaml) and [@types/js-yaml](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/js-yaml). These dependencies needed to be updated together.

This is major version upgrade, which deprecates the safeLoad and safeDump
methods. Replace with load and dump, respectively, that are now safe
by default.

Updates `js-yaml` from 3.14.0 to 4.1.0
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](nodeca/js-yaml@3.14.0...4.1.0)

Updates `@types/js-yaml` from 3.12.5 to 4.0.5
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/js-yaml)

---
updated-dependencies:
- dependency-name: js-yaml
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: "@types/js-yaml"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -26,7 +26,7 @@
 		"bundle-schema": "node ./scripts/transform.js"
 	},
 	"devDependencies": {
-		"@types/js-yaml": "^3.12.5",
+		"@types/js-yaml": "^4.0.5",
 		"@types/mocha": "^5.2.7",
 		"@types/node": "^12.11.7",
 		"json-schema-ref-parser": "^7.1.3",
@@ -37,7 +37,7 @@
 		"typescript": "^3.7.5"
 	},
 	"dependencies": {
-		"js-yaml": "^3.14.0",
+		"js-yaml": "^4.1.0",
 		"vscode-json-languageservice": "3.4.9",
 		"vscode-languageserver": "^6.1.1",
 		"vscode-languageserver-textdocument": "^1.0.0",