Bump Serilog from 3.0.1 to 3.1.1 in /src

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]>

src/jjm.one.Serilog.Sinks.SlackWebHook.Example/jjm.one.Serilog.Sinks.SlackWebHook.Example.csproj

@@ -27,7 +27,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Serilog" Version="3.0.1"/>
+        <PackageReference Include="Serilog" Version="3.1.1"/>
     </ItemGroup>
 
     <ItemGroup>

src/jjm.one.Serilog.Sinks.SlackWebHook.Tests/jjm.one.Serilog.Sinks.SlackWebHook.Tests.csproj

@@ -33,7 +33,7 @@
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2"/>
-        <PackageReference Include="Serilog" Version="3.0.1"/>
+        <PackageReference Include="Serilog" Version="3.1.1"/>
         <PackageReference Include="Slack.Webhooks" Version="1.1.5"/>
     </ItemGroup>
 

src/jjm.one.Serilog.Sinks.SlackWebHook/jjm.one.Serilog.Sinks.SlackWebHook.csproj

@@ -40,7 +40,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="Serilog" Version="3.0.1"/>
+        <PackageReference Include="Serilog" Version="3.1.1"/>
         <PackageReference Include="Serilog.Sinks.PeriodicBatching" Version="3.1.0"/>
         <PackageReference Include="Slack.Webhooks" Version="1.1.5"/>
     </ItemGroup>