Bump actions/setup-python from 5 to 6

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5 to 6.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/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] <support@github.com>

.github/workflows/ci-tests.yml

diff --git a/.github/workflows/ci-tests.yml b/.github/workflows/ci-tests.yml
index 140c454..ceb0cdb 100644
--- a/.github/workflows/ci-tests.yml
+++ b/.github/workflows/ci-tests.yml
@@ -79,7 +79,7 @@
         steps:
             - uses: actions/checkout@v4
             - name: Setup python
-              uses: actions/setup-python@v5
+              uses: actions/setup-python@v6
               with:
                   python-version: ${{ matrix.py }}
                   architecture: ${{ matrix.architecture }}
@@ -99,7 +99,7 @@
         steps:
             - uses: actions/checkout@v4
             - name: Setup python
-              uses: actions/setup-python@v5
+              uses: actions/setup-python@v6
               with:
                   python-version: "3.13"
                   architecture: x64
@@ -112,7 +112,7 @@
         steps:
             - uses: actions/checkout@v4
             - name: Setup python
-              uses: actions/setup-python@v5
+              uses: actions/setup-python@v6
               with:
                   python-version: "3.13"
                   architecture: x64
@@ -124,7 +124,7 @@
         steps:
             - uses: actions/checkout@v4
             - name: Setup python
-              uses: actions/setup-python@v5
+              uses: actions/setup-python@v6
               with:
                   python-version: "3.13"
                   architecture: x64