Updated to .NET9 RC2 + other nuget packageds#17235

nikolajlauridsen merged 2 commits intorelease/15.0umbraco/Umbraco-CMS:release/15.0from

v15/hotfix/update-to-dotnet9-rc2-and-openiddict-to-v6-and-a-few-othersumbraco/Umbraco-CMS:v15/hotfix/update-to-dotnet9-rc2-and-openiddict-to-v6-and-a-few-othersCopy head branch name to clipboard