Bump actions/setup-python from 5 to 6 (#723)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci v2.yml

@@ -36,7 +36,7 @@ jobs:
       with:
           fetch-depth: 0
 
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       with: { python-version: "3.8" }
 
     - name: get conan
@@ -223,7 +223,7 @@ jobs:
       with:
         submodules: true
 
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       with: { python-version: "3.8" }
 
     - uses: ssciwr/doxygen-install@v1