Bump ramsey/composer-install from 3 to 4

Bumps [ramsey/composer-install](https://github.com/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: ramsey/composer-install
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -78,7 +78,7 @@ jobs:
                     coverage: pcov
 
             -   name: Composer install
-                uses: ramsey/composer-install@v3
+                uses: ramsey/composer-install@v4
                 with:
                     dependency-versions: ${{ matrix.dependencies }}
                     composer-options: ${{ matrix.composer-options }}
@@ -126,7 +126,7 @@ jobs:
                     tools: phive, cs2pr
 
             -   name: Composer install
-                uses: ramsey/composer-install@v3
+                uses: ramsey/composer-install@v4
 
             -   name: Install PHP tools with phive.
                 run: "phive install --trust-gpg-keys 'CF1A108D0E7AE720,51C67305FFC2E5C0,99BF4D9A33D65E1E'"