Remove lowest from phpunit.yml

To reduce the Composer cache size.

Author: kenjis

.github/workflows/phpunit.yml

@@ -29,7 +29,7 @@ permissions:
 
 jobs:
   main:
-    name: PHP ${{ matrix.php-versions }} - ${{ matrix.db-platforms }} - ${{ matrix.dependencies }}
+    name: PHP ${{ matrix.php-versions }} - ${{ matrix.db-platforms }}
     runs-on: ubuntu-latest
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     strategy:
@@ -43,27 +43,18 @@ jobs:
           - php-versions: '7.4'
             db-platforms: MySQLi
             mysql-versions: '8.0'
-            dependencies: 'highest'
-          # Lowest Dependency
-          - php-versions: '7.4'
-            db-platforms: MySQLi
-            mysql-versions: '5.7'
-            dependencies: 'lowest'
           # Postgre
           - php-versions: '7.4'
             db-platforms: Postgre
             mysql-versions: '5.7'
-            dependencies: 'highest'
           # SQLSRV
           - php-versions: '7.4'
             db-platforms: SQLSRV
             mysql-versions: '5.7'
-            dependencies: 'highest'
           # OCI8
           - php-versions: '7.4'
             db-platforms: OCI8
             mysql-versions: '5.7'
-            dependencies: 'highest'
 
     services:
       mysql: