remove builds for abandoned adapters

Author: dbu

.github/workflows/ci.yml

@@ -17,8 +17,6 @@ jobs:
         batch:
           - { suite: "curl",    php: '7.4', package: "php-http/curl-client laminas/laminas-diactoros php-http/message-factory" }
           - { suite: "Socket",  php: '7.4', package: "php-http/socket-client php-http/client-common php-http/message-factory" }
-          - { suite: "Guzzle5", php: '7.4', package: "php-http/guzzle5-adapter php-http/message-factory" }
-          - { suite: "Guzzle6", php: '7.4', package: "php-http/guzzle6-adapter php-http/message-factory" }
           - { suite: "Guzzle",  php: '7.4', package: "guzzlehttp/guzzle php-http/message-factory" }
           - { suite: "Guzzle",  php: '8.3', package: "guzzlehttp/guzzle php-http/message-factory" }
           - { suite: "Guzzle",  php: '7.4', package: "guzzlehttp/guzzle phpunit/phpunit:^8.5.8 php-http/message-factory" }