⬆️ Bump actions/setup-python from 4 to 6

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 4 to 6.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v4...v6)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build-init.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v6
       with:
         python-version: 3.9
 

.github/workflows/build-vagrant.yml

@@ -26,7 +26,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v6
       with:
         python-version: 3.9
 

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v6
       with:
         python-version: 3.13
     - uses: pre-commit/action@v3.0.0
@@ -26,7 +26,7 @@ jobs:
   #   steps:
   #   - uses: actions/checkout@v3
   #   - name: Set up Python
-  #     uses: actions/setup-python@v4
+  #     uses: actions/setup-python@v6
   #     with:
   #       python-version: 3.8
   #   - name: install tox