tf-stage2: update keycloak provider to 3.8.1

Evangelos Foutras requested to merge tf-update-keycloak-provider into master

OpenID clients:

  • use_refresh_tokens set to false to preserve the values on live
  • backchannel_logout_session_required implicitly changed to true for the 'grafana_openid_client' and 'openid_gitlab' clients

SAML client (GitLab):

  • front_channel_logout set to false to preserve the live setting
Edited by Evangelos Foutras

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