Update @actions/github to v6.0.0 to fix Dependabot vulnerabilities

Author: dydx

.github/actions/pr-labels/package.json

@@ -16,7 +16,7 @@
   "author": "",
   "dependencies": {
     "@actions/core": "^1.10.0",
-    "@actions/github": "^5.1.1"
+    "@actions/github": "^6.0.0"
   },
   "devDependencies": {
     "@vercel/ncc": "^0.36.1",