ci: bump actions/setup-python from 5.3.0 to 6.0.0

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5.3.0 to 6.0.0.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/v5.3.0...v6.0.0)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/constraints.txt

@@ -2,5 +2,5 @@ pip==24.2
 nox==2024.10.9
 nox-poetry==1.0.3
 poetry==1.8.4
-virtualenv==20.35.4
+virtualenv==20.27.1
 toml==0.10.2

.github/workflows/pre-release.yml

@@ -15,7 +15,7 @@ jobs:
           fetch-depth: 2
 
       - name: Set up Python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@v6.0.0
         with:
           python-version: "3.10"
 

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
         with:
           fetch-depth: 2
       - name: Set up Python
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@v6.0.0
         with:
           python-version: "3.11"
       - name: Install pip and poetry

.github/workflows/tests.yml

@@ -31,7 +31,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python }}
-        uses: actions/setup-python@v5.3.0
+        uses: actions/setup-python@v6.0.0
         with:
           python-version: ${{ matrix.python }}