Bump actions/setup-python from 5 to 6 (#6965) [skip ci]

Author: dependabot[bot]

.github/workflows/1_create_release_pr.yml

@@ -43,7 +43,7 @@ jobs:
         uses: cylc/release-actions/check-shortlog@v1
 
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.x'
 

.github/workflows/2_auto_publish_release.yml

@@ -38,7 +38,7 @@ jobs:
         ref: ${{ env.MERGE_SHA }}
 
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.x'
 

.github/workflows/test_tutorial_workflow.yml

@@ -39,7 +39,7 @@ jobs:
     timeout-minutes: 10
     steps:
       - name: configure python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}