Test on .NET 10 and upgrade deps

[hangy]

• build: Use .NET 10.0 SDK
• test: Add net10.0 target
• ci: Bump GitHub actions versions
• chore(deps): Bump Serilog from 4.2.0 to 4.3.0
• chore(dev-deps):
  • Bump Microsoft.NET.Test.Sdk from 15.9.0 to 18.0.1
  • Bump xunit from 2.4.1 to 2.9.3
  • Bump xunit.runner.visualstudio from 2.4.1 to 3.1.5

[nblumhardt]

Nice! 👍