GH Actions: 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/release.yml

@@ -93,7 +93,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v5
 
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           name: parallel-lint-phar
 
@@ -115,7 +115,7 @@ jobs:
       - verify
 
     steps:
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           name: parallel-lint-phar
 

.github/workflows/test.yml

@@ -165,7 +165,7 @@ jobs:
         if: ${{ startsWith( steps.phpunit_version.outputs.VERSION, '10.' ) }}
         run: composer test10
 
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           name: parallel-lint-phar