chore(deps): update actions/setup-python action to v7 (#963)

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

Author: renovate[bot]

.github/actions/setup-python-env/action.yml

@@ -14,7 +14,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/setup-python@v6
+    - uses: actions/setup-python@v7
       with:
         python-version: ${{inputs.python-version}}
 

.github/workflows/ci.yml

@@ -118,7 +118,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha || github.ref }}
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: "3.14" # match what's in .readthedocs.yml