Bumped upload-artifact action to v7

v7 of upload-artifact now supports uploading single file (unzipped)
artifacts - the Github UI appears to have changed to reflect this
and is now treating the `pulp-repo-versions.yml` artifact as a yaml file
even though it's actually a zip file

bumping the action to v7 and just uploading the yaml file seems like the
best option here

Author: owenjones

.github/workflows/package-update-kayobe.yml

@@ -61,8 +61,9 @@ jobs:
       # For now, just create an artifact that the user can download.
       - name: Upload pulp-repo-versions.yml artifact
         if: ${{ steps.git-diff.outputs.changed == 'true' }}
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: pulp-repo-versions.yml
           path: stackhpc-kayobe-config/etc/kayobe/pulp-repo-versions.yml
+          archive: false
           retention-days: 1