chore: remove duplicated 8.4

Author: kenjis

.github/workflows/test-phpunit.yml

@@ -59,7 +59,6 @@ jobs:
           - '8.1'
           - '8.2'
           - '8.3'
-          - '8.4'
         include:
           - php-version: '8.4'
             composer-option: '--ignore-platform-req=php'
@@ -90,7 +89,6 @@ jobs:
           - '8.1'
           - '8.2'
           - '8.3'
-          - '8.4'
         db-platform:
           - MySQLi
           - OCI8
@@ -133,7 +131,6 @@ jobs:
           - '8.1'
           - '8.2'
           - '8.3'
-          - '8.4'
         include:
           - php-version: '8.4'
             composer-option: '--ignore-platform-req=php'
@@ -163,7 +160,6 @@ jobs:
           - '8.1'
           - '8.2'
           - '8.3'
-          - '8.4'
         include:
           - php-version: '8.4'
             composer-option: '--ignore-platform-req=php'