Bump Serilog from 3.0.1 to 3.1.1

Bumps [Serilog](https://github.com/serilog/serilog) from 3.0.1 to 3.1.1.
- [Release notes](https://github.com/serilog/serilog/releases)
- [Commits](serilog/serilog@v3.0.1...v3.1.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

Directory.Packages.props

@@ -34,7 +34,7 @@
     <PackageVersion Include="Scriban" Version="5.9.0" />
     <PackageVersion Include="Serilog.Sinks.Console" Version="5.0.0" />
     <PackageVersion Include="Serilog.Sinks.MSBuild" Version="1.5.0" />
-    <PackageVersion Include="Serilog" Version="3.0.1" />
+    <PackageVersion Include="Serilog" Version="3.1.1" />
     <PackageVersion Include="Sigourney.Build" Version="0.4.1" />
     <PackageVersion Include="Sigourney" Version="0.4.1" />
     <PackageVersion Include="System.Buffers" Version="4.5.1" />