Update dependency vscode-languageclient to v9 (#448)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -550,7 +550,7 @@
     "antlr4": "^4.11.0",
     "antlr4ts": "^0.5.0-alpha.4",
     "semver": "^7.3.8",
-    "vscode-languageclient": "^8.0.2",
+    "vscode-languageclient": "^9.0.0",
     "which": "^4.0.0"
   },
   "devDependencies": {