Update offline-github-changelog to version 2.4.0

Author: depfu[bot]

package.json

@@ -24,7 +24,7 @@
     "minimist": "^1.2.0",
     "mocha": "^8.2.1",
     "nyc": "^15.0.0",
-    "offline-github-changelog": "^1.7.0",
+    "offline-github-changelog": "^2.4.0",
     "prettier": "~2.5.0",
     "unexpected": "^12.0.0",
     "unexpected-documentation-site-generator": "^6.0.0",