Bump Serilog from 2.11.0 to 2.12.0 in /source (#70)

Bumps [Serilog](https://github.com/serilog/serilog) from 2.11.0 to 2.12.0.
- [Release notes](https://github.com/serilog/serilog/releases)
- [Changelog](https://github.com/serilog/serilog/blob/dev/CHANGES.md)
- [Commits](serilog/serilog@v2.11.0...v2.12.0)

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

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

Author: dependabot[bot]

source/CommandLine/CommandLine.csproj

@@ -37,7 +37,7 @@
 
     <ItemGroup>
         <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
-        <PackageReference Include="Serilog" Version="2.11.0" />
+        <PackageReference Include="Serilog" Version="2.12.0" />
     </ItemGroup>
     <ItemGroup>
         <None Include="icon.png" Pack="true" PackagePath="\" />

source/Tests/Tests.csproj

@@ -9,7 +9,7 @@
     <ItemGroup>
       <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.1" />
       <PackageReference Include="NUnit" Version="3.13.3" />
-      <PackageReference Include="Serilog" Version="2.11.0" />
+      <PackageReference Include="Serilog" Version="2.12.0" />
       <PackageReference Include="Serilog.Sinks.TextWriter" Version="2.1.0" />
       <PackageReference Include="NSubstitute" Version="4.4.0" />
       <PackageReference Include="FluentAssertions" Version="6.7.0" />