Remove unnecessary dependency on `typescript`

lib/semmle-vscode-utils/package.json

@@ -21,7 +21,6 @@
     "@github/codeql-build-tasks": "^0.0.2",
     "@types/node": "^12.0.8",
     "@types/vscode": "^1.39.0",
-    "typescript": "^3.7.2",
     "typescript-config": "^0.0.1",
     "typescript-formatter": "^7.2.2"
   }