Use Python 3.12 to build source and docs on CI

Author: hugovk

.github/workflows/source-and-docs-release.yml

@@ -92,7 +92,7 @@ jobs:
       - name: "Setup Python"
         uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
-          python-version: 3.11
+          python-version: 3.12
 
       - name: "Install source dependencies"
         run: |
@@ -129,7 +129,7 @@ jobs:
       - name: "Setup Python"
         uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
-          python-version: 3.11
+          python-version: 3.12
 
       - name: "Install docs dependencies"
         run: |