Update mega-linter.yml

Author: lukemurraynz

.github/workflows/mega-linter.yml

@@ -54,7 +54,7 @@ jobs:
       # Upload MegaLinter artifacts
       - name: Archive production artifacts
         if: ${{ success() }} || ${{ failure() }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: MegaLinter reports
           path: |