chore(deps): update github artifact actions (#671)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -137,7 +137,7 @@ jobs:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     - name: Save cryostat image
       run: podman save -o cryostat.tar --format oci-archive quay.io/cryostat/cryostat:latest
-    - uses: actions/upload-artifact@v6
+    - uses: actions/upload-artifact@v7
       with:
         name: cryostat
         path: ${{ github.workspace }}/cryostat.tar
@@ -155,7 +155,7 @@ jobs:
         packages: write
     steps:
     - name: Download cryostat artifact
-      uses: actions/download-artifact@v7
+      uses: actions/download-artifact@v8
       with:
         name: cryostat
     - name: Load cryostat image