chore(deps): bump Serilog from 3.0.1 to 3.1.1 (#79)

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

test/MockHttp.Server.Tests/MockHttp.Server.Tests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFrameworks>net7.0;net6.0;netcoreapp3.1</TargetFrameworks>
@@ -11,7 +11,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Serilog" Version="3.0.1" />
+    <PackageReference Include="Serilog" Version="3.1.1" />
     <PackageReference Include="Serilog.Extensions.Logging" Version="$(SerilogExtensionsLoggingVersion)" />
     <PackageReference Include="Serilog.Sinks.Debug" Version="2.0.0" />
     <PackageReference Include="Serilog.Sinks.TestCorrelator" Version="3.2.0" />