Issue #3385388: Remove/Reevaluate guzzle6-adapter dependency after Drupal 9 EOL
requested to merge issue/search_api_meilisearch-3385388:3385388-removereevaluate-guzzle6-adapter-dependency into 2.x
Removed guzzle6-adapter dependency and switched Meilisearch Client to use official GuzzleHttp\Client.
Closes #3385388