chore(deps): update vexxhost/docker-atmosphere digest to 9b90ea6 (#1194)

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

Author: renovate[bot]

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
       packages: write
       pull-requests: write
     steps:
-      - uses: vexxhost/docker-atmosphere/.github/actions/build-image@b6113e0668dc85929f783667f0347fc76b272844 # main
+      - uses: vexxhost/docker-atmosphere/.github/actions/build-image@9b90ea63bb319c20f3d3e3d9688c36180580d1f2 # main
         with:
           image-name: python-openstackclient
           push: ${{ github.event_name != 'pull_request' }}