Bump Serilog from 2.12.0 to 3.1.1

Bumps [Serilog](https://github.com/serilog/serilog) from 2.12.0 to 3.1.1.
- [Release notes](https://github.com/serilog/serilog/releases)
- [Commits](serilog/serilog@v2.12.0...v3.1.1)

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

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

Author: dependabot[bot]

src/Directory.Packages.props

@@ -8,7 +8,7 @@
     <PackageVersion Include="Akka.Cluster" Version="$(AkkaVersion)" />
     <PackageVersion Include="Akka.Cluster.Hosting" Version="$(AkkaHostingVersion)" />
 
-    <PackageVersion Include="Serilog" Version="2.12.0" />
+    <PackageVersion Include="Serilog" Version="3.1.1" />
     <PackageVersion Include="Serilog.Sinks.Console" Version="4.1.0" />
     <PackageVersion Include="Serilog.Sinks.File" Version="5.0.0" />
   </ItemGroup>