Bump actions/download-artifact from 5 to 6

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build-verification.yml

@@ -37,7 +37,7 @@ jobs:
           java-version: '21'
           distribution: 'temurin'
       - name: Download plugin to maven local
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: common-custom-user-data-maven-plugin
           path: ~/.m2/repository/com/gradle