Update changelog generator action from v2.3 to v2.4 to fix set-output deprecation

The v2.4 release fixes the deprecated set-output command by using GITHUB_OUTPUT
environment file instead. This eliminates the deprecation warning in nightly builds.

Co-authored-by: softhack007 <91616163+softhack007@users.noreply.github.com>

.github/workflows/nightly.yml

@@ -25,7 +25,7 @@ jobs:
         run: ls -la
       - name: "✏️ Generate release changelog"
         id: changelog
-        uses: janheinrichmerker/action-github-changelog-generator@v2.3
+        uses: janheinrichmerker/action-github-changelog-generator@v2.4
         with:
           token: ${{ secrets.GITHUB_TOKEN }} 
           sinceTag: v14.7.1