chore(deps): update dependency vscode-languageserver to v8

Author: renovate-bot

packages/apollo-language-server/package.json

@@ -39,7 +39,7 @@
     "lodash.debounce": "^4.0.8",
     "lodash.merge": "^4.6.1",
     "minimatch": "^5.0.0",
-    "vscode-languageserver": "^7.0.0",
+    "vscode-languageserver": "^8.0.0",
     "vscode-languageserver-textdocument": "^1.0.4",
     "vscode-uri": "1.0.6"
   },