Release 2.5.2 (2023-03-23)

Full Changelog

• Add security checks to FormAdmin (#356) (@datenwerk-at)
• Update SendingBlueEventListener to correctly send DoubleOpt-In emails (#351) (@Prokyonn)
• Fix update existing contact via sending blue (#348) (@alexander-schranz)
• Fix compatibility issue with sulu/sulu@2.5.5 (#347) (@opctim)