chore: Update setup-python action to specific commit

Signed-off-by: Andrew Brandt <[email protected]>

Author: andrewb1269

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

@@ -11,7 +11,7 @@ runs:
   using: "composite"
   steps:
     - name: Set up python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
       with:
         python-version: ${{ inputs.python-version }}