ci(deps): bump actions/download-artifact from 7 to 8 (#1172)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 7 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v7...v8)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -158,7 +158,7 @@ jobs:
       - uses: cvmfs-contrib/github-action-cvmfs@v5
         with:
           cvmfs_repositories: 'oasis.opensciencegrid.org'
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           name: build_ubuntu-latest
       - name: untar build
@@ -180,7 +180,7 @@ jobs:
       - uses: cvmfs-contrib/github-action-cvmfs@v5
         with:
           cvmfs_repositories: 'oasis.opensciencegrid.org'
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           name: build_ubuntu-latest
       - uses: actions/cache/restore@v5
@@ -212,7 +212,7 @@ jobs:
         uses: cvmfs-contrib/github-action-cvmfs@v5
         with:
           cvmfs_repositories: 'oasis.opensciencegrid.org'
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           name: build_ubuntu-latest
       - uses: actions/cache/restore@v5
@@ -262,7 +262,7 @@ jobs:
           java-version: ${{ env.JAVA_VERSION }}
           distribution: ${{ env.java_distribution }}
           cache: maven
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           name: build_${{ matrix.runner }}
       - uses: cvmfs-contrib/github-action-cvmfs@v5
@@ -295,7 +295,7 @@ jobs:
         uses: wtfjoke/setup-groovy@v3
         with:
           groovy-version: ${{ env.groovy_version }}
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           name: build_ubuntu-latest
       - name: untar build
@@ -318,7 +318,7 @@ jobs:
         run: docs/mkdocs/generate.sh pages
       ### jacoco
       - name: download jacoco report artifact
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: jacoco_report
           path: pages/jacoco
@@ -371,7 +371,7 @@ jobs:
       TAG_NAME: ${{ github.ref_name }}
     steps:
       - uses: actions/checkout@v6
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           name: build_ubuntu-latest
       - name: rename artifact