ci: bump actions/setup-python from 6.3.0 to 7.0.0

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 6.3.0 to 7.0.0.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v6.3.0...v7.0.0)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: 7.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/pages.yml

@@ -33,7 +33,7 @@ jobs:
         uses: actions/checkout@v7.0.0
 
       - name: Install Python
-        uses: actions/setup-python@v6.3.0
+        uses: actions/setup-python@v7.0.0
         with:
           python-version: "3.13"
 

.github/workflows/plugin-validate.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v7.0.0
       - name: Install zsh (for shell-portability checks)
         run: sudo apt-get update -qq && sudo apt-get install -y -qq zsh
-      - uses: actions/setup-python@v6.3.0
+      - uses: actions/setup-python@v7.0.0
         with:
           python-version: "3.13"
       - run: pip install --quiet pyyaml