Bump actions/setup-python from 5 to 6 (#416)

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5 to 6.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v5...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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/docs-build.yml

@@ -10,7 +10,7 @@ jobs:
             - uses: actions/checkout@v4
               with:
                   fetch-depth: 0
-            - uses: actions/setup-python@v5
+            - uses: actions/setup-python@v6
               with:
                   python-version: "3.12"
             - name: Install GDAL

.github/workflows/docs.yml

@@ -8,7 +8,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - uses: actions/checkout@v4
-            - uses: actions/setup-python@v5
+            - uses: actions/setup-python@v6
               with:
                   python-version: "3.12"
             - name: Install dependencies

.github/workflows/pypi.yml

@@ -14,7 +14,7 @@ jobs:
         steps:
             - uses: actions/checkout@v4
             - name: Set up Python
-              uses: actions/setup-python@v5
+              uses: actions/setup-python@v6
               with:
                   python-version: "3.x"
             - name: Install dependencies

.github/workflows/ubuntu.yml

@@ -25,7 +25,7 @@ jobs:
             - name: CHECKOUT CODE
               uses: actions/checkout@v4
             - name: SETUP PYTHON
-              uses: actions/setup-python@v5
+              uses: actions/setup-python@v6
               with:
                   python-version: ${{ matrix.config.py }}
             - name: Install GDAL