Bump actions/setup-python from 6 to 7

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 6 to 7.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v6...v7)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/publish.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: 3.9
       - name: Install Flit

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: 3.9
       - name: Install Flit

.github/workflows/test_full.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install Flit
@@ -29,7 +29,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: '3.13'
       - name: Install Flit