.github: bump upload-artifact action to v4

Author: ellemouton

.github/workflows/main.yml

@@ -237,7 +237,7 @@ jobs:
         run: 7z a logs-itest.zip itest/**/*.log
 
       - name: Upload log files on failure
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: ${{ failure() }}
         with:
           name: logs-itest