Bump the github-actions group with 2 updates

Bumps the github-actions group with 2 updates: [actions/checkout](https://github.com/actions/checkout) and [ramsey/composer-install](https://github.com/ramsey/composer-install).


Updates `actions/checkout` from 4 to 7
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v7)

Updates `ramsey/composer-install` from 3 to 4
- [Release notes](https://github.com/ramsey/composer-install/releases)
- [Commits](ramsey/composer-install@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: ramsey/composer-install
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/mutation.yml

@@ -49,7 +49,7 @@ jobs:
 
     steps:
       - name: Checkout.
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
 
       - name: Install PHP with extensions.
         uses: shivammathur/setup-php@v2
@@ -60,7 +60,7 @@ jobs:
           coverage: pcov
 
       - name: Install Composer dependencies
-        uses: ramsey/composer-install@v3
+        uses: ramsey/composer-install@v4
 
       - name: Install db.
         uses: yiisoft/actions/install-packages@master