chore(deps): update actions/upload-artifact digest to b4b15b8

Author: renovate[bot]

.github/workflows/on-PRs-commits.yml

@@ -62,7 +62,7 @@ jobs:
       # > to download artifact contents individually. One of the consequences of this limitation is that if a zip is
       # > uploaded during a workflow run and then downloaded from the UI, there will be a double zip created.
       - name: Archive bosh dev release tgz
-        uses: actions/upload-artifact@84480863f228bb9747b473957fcc9e309aa96097 # v4
+        uses: actions/upload-artifact@b4b15b8c7c6ac21ea08fcf65892d2ee8f75cf882 # v4
         with:
           name: archive-bosh-dev-release-tgz
           path: |