Bump monaco-editor from 0.20.0 to 0.21.0 (#709)

Bumps [monaco-editor](https://github.com/Microsoft/monaco-editor) from 0.20.0 to 0.21.0.
- [Release notes](https://github.com/Microsoft/monaco-editor/releases)
- [Changelog](https://github.com/microsoft/monaco-editor/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Microsoft/monaco-editor/compare/v0.20.0...v0.21.0)

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

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

package.json

@@ -19,6 +19,6 @@
     "webpack-dev-server": "^3.11.0"
   },
   "dependencies": {
-    "monaco-editor": "^0.20.0"
+    "monaco-editor": "^0.21.0"
   }
 }

yarn.lock

@@ -2815,10 +2815,10 @@ mkdirp@^1.0.3, mkdirp@^1.0.4:
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-1.0.4.tgz#3eb5ed62622756d79a5f0e2a221dfebad75c2f7e"
   integrity sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==
 
-monaco-editor@^0.20.0:
-  version "0.20.0"
-  resolved "https://registry.yarnpkg.com/monaco-editor/-/monaco-editor-0.20.0.tgz#5d5009343a550124426cb4d965a4d27a348b4dea"
-  integrity sha512-hkvf4EtPJRMQlPC3UbMoRs0vTAFAYdzFQ+gpMb8A+9znae1c43q8Mab9iVsgTcg/4PNiLGGn3SlDIa8uvK1FIQ==
+monaco-editor@^0.21.0:
+  version "0.21.0"
+  resolved "https://registry.yarnpkg.com/monaco-editor/-/monaco-editor-0.21.0.tgz#35d964cbeff8b035d574bb113e9491331810d5f1"
+  integrity sha512-fUmW7iC+wKWMetD44iVacEoSi+RqkA+C0vQvAk/FkEugg70iwGGLj5WoheAULaxLASQbYiapD2+85FJ0cnErYg==
 
 move-concurrently@^1.0.1:
   version "1.0.1"