Bump highlight js versions (microsoft#187619)

Fixes microsoft#187605

Author: mjbvz

extensions/markdown-language-features/package.json

@@ -723,7 +723,7 @@
   "dependencies": {
     "@vscode/extension-telemetry": "0.7.5",
     "dompurify": "^2.4.1",
-    "highlight.js": "^11.4.0",
+    "highlight.js": "^11.8.0",
     "markdown-it": "^12.3.2",
     "markdown-it-front-matter": "^0.2.1",
     "morphdom": "^2.6.1",

extensions/markdown-language-features/yarn.lock

@@ -378,10 +378,10 @@ form-data@^4.0.0:
     combined-stream "^1.0.8"
     mime-types "^2.1.12"
 
-highlight.js@^11.4.0:
-  version "11.4.0"
-  resolved "https://registry.yarnpkg.com/highlight.js/-/highlight.js-11.4.0.tgz#34ceadd49e1596ee5aba3d99346cdfd4845ee05a"
-  integrity sha512-nawlpCBCSASs7EdvZOYOYVkJpGmAOKMYZgZtUqSRqodZE0GRVcFKwo1RcpeOemqh9hyttTdd5wDBwHkuSyUfnA==
+highlight.js@^11.8.0:
+  version "11.8.0"
+  resolved "https://registry.yarnpkg.com/highlight.js/-/highlight.js-11.8.0.tgz#966518ea83257bae2e7c9a48596231856555bb65"
+  integrity sha512-MedQhoqVdr0U6SSnWPzfiadUcDHfN/Wzq25AkXiQv9oiOO/sG0S7XkvpFIqWBl9Yq1UYyYOOVORs5UW2XlPyzg==
 
 http-proxy-agent@^5.0.0:
   version "5.0.0"