CI: Bump ramsey/composer-install from 3.2.1 to 4.0.0 (#6)

Bumps [ramsey/composer-install](https://github.com/ramsey/composer-install) from 3.2.1 to 4.0.0.
- [Release notes](https://github.com/ramsey/composer-install/releases)
- [Commits](ramsey/composer-install@a8d0d95...65e4f84)

---
updated-dependencies:
- dependency-name: ramsey/composer-install
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -23,7 +23,7 @@ jobs:
           php-version: ${{ matrix.php }}
           coverage: none
 
-      - uses: ramsey/composer-install@a8d0d959dab41457692a5e2041bd9b757a119e3f # v3
+      - uses: ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda # v3
 
       - name: Unit tests
         run: vendor/bin/unit-tests
@@ -43,7 +43,7 @@ jobs:
           php-version: '8.3'
           coverage: none
 
-      - uses: ramsey/composer-install@a8d0d959dab41457692a5e2041bd9b757a119e3f # v3
+      - uses: ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda # v3
 
       - name: Unit tests with coverage
         run: phpdbg -qrr vendor/bin/unit-tests
@@ -68,7 +68,7 @@ jobs:
           php-version: '8.3'
           coverage: none
 
-      - uses: ramsey/composer-install@a8d0d959dab41457692a5e2041bd9b757a119e3f # v3
+      - uses: ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda # v3
 
       - name: PHPStan
         run: vendor/bin/phpstan analyse --no-progress