update css service (#245688)

Author: aeschli

extensions/css-language-features/server/package-lock.json

@@ -11,7 +11,7 @@
   "browser": "./dist/browser/cssServerMain",
   "dependencies": {
     "@vscode/l10n": "^0.0.18",
-    "vscode-css-languageservice": "^6.3.3",
+    "vscode-css-languageservice": "^6.3.4",
     "vscode-languageserver": "^10.0.0-next.11",
     "vscode-uri": "^3.0.8"
   },

extensions/css-language-features/server/package.json

@@ -10,7 +10,7 @@
   "main": "./out/node/htmlServerMain",
   "dependencies": {
     "@vscode/l10n": "^0.0.18",
-    "vscode-css-languageservice": "^6.3.3",
+    "vscode-css-languageservice": "^6.3.4",
     "vscode-html-languageservice": "^5.3.3",
     "vscode-languageserver": "^10.0.0-next.12",
     "vscode-languageserver-textdocument": "^1.0.12",