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

Ref: PACT-445

Author: pactflow-renovate-bot[bot]

.github/workflows/verify_changed_pact.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
-      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
+      - uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6
         with:
           python-version: '3.13' 
           architecture: 'x64'