[release-branches] Fix the reference that gets checked out (#2294)

    steps:

    - uses: actions/checkout@v3

      with:

        ref: ${{ inputs.release_branch }}

        ref: ${{ needs.get-or-create-release-branch.outputs.release_branch }}

        path: smithy-rs

        token: ${{ secrets.RELEASE_AUTOMATION_BOT_PAT }}

    - name: Upgrade gradle.properties