Upgrade to .net 8

What's Changed

• 📝 Update ArgoCd example by @mmalyska in #47
• Bump xunit.runner.visualstudio from 2.4.5 to 2.8.0 by @dependabot in #48
• Bump coverlet.msbuild from 3.2.0 to 6.0.2 by @dependabot in #49
• Bump Microsoft.NET.Test.Sdk from 17.5.0 to 17.9.0 by @dependabot in #51
• Bump xunit from 2.4.2 to 2.8.0 by @dependabot in #53
• Bump coverlet.collector from 3.2.0 to 6.0.2 by @dependabot in #55
• upgrade to .net 8 by @mmalyska in #57
• Bump Microsoft.Extensions.Logging from 7.0.0 to 8.0.0 by @dependabot in #54
• Bump System.Text.Json from 7.0.2 to 8.0.3 by @dependabot in #50
• Bump YamlDotNet from 13.0.1 to 15.1.2 by @dependabot in #56
• Bump Moq from 4.18.4 to 4.20.70 by @dependabot in #52

Full Changelog: v0.2.1...v0.3.0