Bump actions/setup-python from 5 to 7

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5 to 7.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v5...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/documentation.yml

@@ -18,7 +18,7 @@ jobs:
     if: github.repository == 'web-platform-tests/wpt'
     steps:
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v7
         with:
           python-version: '3.12'
       - name: Set up Node

.github/workflows/manifest.yml

@@ -12,7 +12,7 @@ jobs:
     if: github.repository == 'web-platform-tests/wpt'
     steps:
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v7
       with:
         python-version: '3.12'
     - name: Checkout

.github/workflows/regen_certs.yml

@@ -11,7 +11,7 @@ jobs:
     if: github.repository == 'web-platform-tests/wpt'
     steps:
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v7
       with:
         python-version: '3.12'
     - name: Checkout

.github/workflows/update_codeowners.yml

@@ -12,7 +12,7 @@ jobs:
     if: github.repository == 'web-platform-tests/wpt'
     steps:
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v7
       with:
         python-version: '3.12'
     - name: Checkout wpt