Update actions/upload-artifact action to v6 (#84)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/mega-linter.yml

@@ -50,7 +50,7 @@ jobs:
       # Upload Mega-Linter artifacts
       - name: Archive production artifacts
         if: success() || failure()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: Mega-Linter reports
           include-hidden-files: "true"