fix: #3624483 complete D12 preparation

Frédéric G. Marandrequested to merge
issue/adminrss-3624483:3624483--settings-form into 8.x-1.x

fix: #3624483 Settings form crashes on Drupal 11: ConfigFormBase::__construct() requires the typed config manager

  • fix deprecations and prepare D12 compatibility

By: fgm

Closes #3624483

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