[CI] Add openstacksdk to installed packages of homebrew VMs.

Openstack is needed to upload the tar files in nightlies.

Author: hageboeck

.github/workflows/update-brew-macs.yml

@@ -61,7 +61,7 @@ jobs:
       - name: Update brew packages
         run: |
             brew update
-            brew install ca-certificates ccache googletest "${OPENJDK_PACKAGE_BREW}" pyenv "${PYTHON_PACKAGE_BREW}"
+            brew install ca-certificates ccache googletest "${OPENJDK_PACKAGE_BREW}" pyenv "${PYTHON_PACKAGE_BREW} openstacksdk"
             echo "Installing official brew deps: $(brew deps --direct --include-build root)"
             brew install $(brew deps --direct --include-build root)