Merge pull request #2827 from FirelyTeam/release/5.9.0

start new development phase 5.9.1

Author: ewoutkramer

release-notes.md

@@ -1,5 +1,3 @@
 ## Intro:
 
-Hotfix release:
-
-- Updated `System.Text.Json` to 8.0.4 to solve high risk vulnerability [CVE-2024-30105](https://github.com/advisories/GHSA-hh2w-p6rv-4g7w)
+General improvements and bugfixes