chore(deps): update actions/setup-python action to v6

Author: renovate[bot]

.github/actions/pretest/action.yml

@@ -18,7 +18,7 @@ runs:
       shell: bash
 
     - name: Setup python
-      uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
+      uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548 # v6.1.0
       with:
         python-version: '3.13'