Update actions/setup-python action to v6.3.0 (#145)

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

Author: renovate[bot]

.github/workflows/start.yaml

@@ -38,7 +38,7 @@ jobs:
         repository: glotzerlab/jetstream2-admin
         ref: ${{ inputs.ref }}
     - name: Set up Python
-      uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+      uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
       with:
         python-version: "3.14"
     - name: Install openstack