Bump Serilog from 3.1.1 to 4.2.0 in /src (#55)

Bumps [Serilog](https://github.com/serilog/serilog) from 3.1.1 to 4.2.0.
- [Release notes](https://github.com/serilog/serilog/releases)
- [Commits](serilog/serilog@v3.1.1...v4.2.0)

---
updated-dependencies:
- dependency-name: Serilog
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/Destructurama.JsonNet.Tests/Destructurama.JsonNet.Tests.csproj

@@ -10,7 +10,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
-    <PackageReference Include="Serilog" Version="3.1.1" />
+    <PackageReference Include="Serilog" Version="4.2.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="Shouldly" Version="4.2.1" />
     <PackageReference Include="PublicApiGenerator" Version="11.2.0" />