Update actions/setup-python action to v6

Author: renovate[bot]

.github/workflows/docs.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Update existing dependencies
         run: sudo apt-get update -y
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v6
         with:
           python-version: 3.7
       - name: Install Tox

.github/workflows/pages.yml

@@ -17,7 +17,7 @@ jobs:
         run: |
           git config user.name github-actions[bot]
           git config user.email 41898282+github-actions[bot]@users.noreply.github.com
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.x
       - run: echo "cache_id=$(date --utc '+%V')" >> $GITHUB_ENV 

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v6
       with:
         python-version: '3.x'
     - name: Install dependencies

.github/workflows/tox-tests.yml

@@ -10,7 +10,7 @@ jobs:
       - name: Update existing dependencies
         run: sudo apt-get update -y
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v6
         with:
           python-version: 3.9
       - name: Install Tox
@@ -24,7 +24,7 @@ jobs:
       - name: Update existing dependencies
         run: sudo apt-get update -y
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v6
         with:
           python-version: 3.9
       - name: Install Tox
@@ -38,7 +38,7 @@ jobs:
       - name: Update existing dependencies
         run: sudo apt-get update -y
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v6
         with:
           python-version: 3.9
       - name: Install Tox
@@ -52,7 +52,7 @@ jobs:
       - name: Update existing dependencies
         run: sudo apt-get update -y
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v6
         with:
           python-version: 3.9
       - name: Install Tox
@@ -68,7 +68,7 @@ jobs:
       - name: Install system dependencies
         run: sudo apt-get install -y libkrb5-dev
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v6
         with:
           python-version: 3.9
       - name: Install Tox
@@ -82,7 +82,7 @@ jobs:
       - name: Update existing dependencies
         run: sudo apt-get update -y
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v6
         with:
           python-version: 3.9
       - name: Install Tox
@@ -103,7 +103,7 @@ jobs:
       - name: Update existing dependencies
         run: sudo apt-get update -y
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v6
         with:
           python-version: 3.9
       - name: Install Tox