build: sync language-service version between client and server (#1521)

Author: atscott

server/package.json

@@ -15,12 +15,12 @@
     "ngserver": "./bin/ngserver"
   },
   "dependencies": {
-    "@angular/language-service": "13.0.0-next.9",
+    "@angular/language-service": "13.0.0-next.15",
     "vscode-jsonrpc": "6.0.0",
     "vscode-languageserver": "7.0.0",
     "vscode-uri": "3.0.2"
   },
   "publishConfig": {
     "registry": "https://wombat-dressing-room.appspot.com"
   }
-}
+}