fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-OCTOKITREQUESTERROR-8730854

Author: snyk-bot

package.json

@@ -28,7 +28,7 @@
   "type": "module",
   "dependencies": {
     "@actions/core": "^1.5.0",
-    "@actions/github": "^5.0.0",
+    "@actions/github": "^6.0.0",
     "commander": "^8.1.0",
     "cross-fetch": "^3.1.4",
     "log4js": "^6.3.0",