Bump actions/setup-python from 5 to 6

.github/workflows/build.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Setup Graphviz
       run: sudo apt update && sudo apt install -y graphviz
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.10'
     - name: Install Python dependencies
@@ -58,7 +58,7 @@ jobs:
         latexmk
         xindy
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.10'
     - name: Install Python dependencies

.github/workflows/changelog.yml

@@ -25,7 +25,7 @@ jobs:
       with:
         ref: ${{ github.event.client_payload.branch }}
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: 3.13
     - name: Install Python dependencies

.github/workflows/pre-commit.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v5
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
     - uses: pre-commit/action@v3.0.1
       env:
         SKIP: rstcheck

.github/workflows/sphinx.yml

@@ -12,7 +12,7 @@ jobs:
     - name: Clone repository
       uses: actions/checkout@v5
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.13'
     - name: Install Python dependencies
@@ -31,7 +31,7 @@ jobs:
     - name: Set up Graphviz
       run: sudo apt update && sudo apt install -y graphviz
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.13'
     - name: Install Python dependencies