Bump actions/upload-artifact from 5 to 6 (#510)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/mega-linter.yml

@@ -55,7 +55,7 @@ jobs:
       # Upload MegaLinter artifacts
       - name: Archive production artifacts
         if: success() || failure()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: MegaLinter reports
           path: |