Bump actions/setup-python from 5 to 6 (#256)

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
...

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

Author: dependabot[bot]

.github/workflows/package.yml

@@ -17,7 +17,7 @@ jobs:
                 submodules: recursive
                 fetch-depth: 0
         -   name: Set up Python
-            uses: actions/setup-python@v5
+            uses: actions/setup-python@v6
             with:
                 python-version: 3.11
         -   name: Display Python version

.github/workflows/system_tests.yml

@@ -27,7 +27,7 @@ jobs:
         -   name: Clone repo
             uses: actions/checkout@v5
         -   name: Set up Python ${{ matrix.python-version }}
-            uses: actions/setup-python@v5
+            uses: actions/setup-python@v6
             with:
                 python-version: ${{ matrix.python-version }}
         -   name: Install dependencies

.github/workflows/test_and_coverage.yml

@@ -27,7 +27,7 @@ jobs:
             uses: actions/checkout@v5
 
         -   name: Set up Python ${{ matrix.python-version }}
-            uses: actions/setup-python@v5
+            uses: actions/setup-python@v6
             with:
                 python-version: ${{ matrix.python-version }}