Stop testing buzz-adapter

It's not compatible with HTTPlug 2.0

Author: ruudk

.github/workflows/continuous-integration.yml

@@ -44,10 +44,6 @@ jobs:
             php-version: "8.2"
             symfony-deprecations-helper: "weak"
 
-          # Test with httplug 1.x clients
-          - dependencies: "php-http/buzz-adapter:^1.0 php-http/guzzle6-adapter:^1.1.1 php-http/react-adapter:^0.2.1"
-            php-version: "7.3"
-            symfony-deprecations-helper: "weak"
           # Test with httplug 2.x clients
           - dependencies: "php-http/guzzle7-adapter php-http/curl-client:^2.0.0 php-http/vcr-plugin:^1.0@dev php-http/socket-client:^2.0"
             php-version: "7.3"