Release 3.0.0

What's Changed

• Refactor: To file-scoped namespaces by @johnkors in #18
• chore: enables implicit usings by @johnkors in #19
• .NET 8 support by @johnkors in #20

Full Changelog: 2.0.3...3.0.0

cd3b400 Merge pull request #20 from johnkors/chore/dotnet-8
8f84709 Update GitVersion to reflect master to main change
7b387c6 Update GitVersion
78d3941 Switch default upstream from master to main
bb3d2d9 .NET 8 support
41143ad Merge pull request #19 from johnkors/chore/implicit-using
483f729 chore: enables implicit usings
a3c329b Merge pull request #18 from johnkors/chore/file-scoped-ns
773f2ca Refactor: To file-scoped namespaces