build: Bump the github-actions group with 2 updates

Bumps the github-actions group with 2 updates: [actions/upload-artifact](https://github.com/actions/upload-artifact) and [actions/download-artifact](https://github.com/actions/download-artifact).


Updates `actions/upload-artifact` from 6 to 7
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v6...v7)

Updates `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/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
         run: composer install --no-progress --optimize-autoloader --prefer-dist --no-interaction
 
       - name: Upload vendor and composer.lock as artifact
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: vendor-artifact
           path: |
@@ -56,7 +56,7 @@ jobs:
           tools: composer:2
 
       - name: Download vendor artifact from build
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: vendor-artifact
           path: .
@@ -81,7 +81,7 @@ jobs:
           tools: composer:2
 
       - name: Download vendor artifact from build
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: vendor-artifact
           path: .