Use new static self in s3 plugin

Sorry this needed to be in flysystem_s3

@richard_hoogstad if you would be kind enough to open this issue in the flysystem_s3 project, and relate it to this issue, I would very much appreciate that.

@lhridley, the issue is already created: https://www.drupal.org/project/flysystem_s3/issues/3446367 🐛 Use new static self in s3 plugin Needs review . We accidentally used the create button in the wrong browser tab. Nothing needs to be done here :)