Bump Akka.Logger.Serilog from 1.5.12.1 to 1.5.25 (#469)

Bumps [Akka.Logger.Serilog](https://github.com/akkadotnet/Akka.Logger.Serilog) from 1.5.12.1 to 1.5.25.
- [Release notes](https://github.com/akkadotnet/Akka.Logger.Serilog/releases)
- [Changelog](https://github.com/akkadotnet/Akka.Logger.Serilog/blob/dev/RELEASE_NOTES.md)
- [Commits](https://github.com/akkadotnet/Akka.Logger.Serilog/commits/1.5.25)

---
updated-dependencies:
- dependency-name: Akka.Logger.Serilog
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/Akka.Hosting.Tests/Akka.Hosting.Tests.csproj

@@ -4,7 +4,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Akka.Logger.Serilog" Version="1.5.12.1" />
+    <PackageReference Include="Akka.Logger.Serilog" Version="1.5.25" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="7.0.0" />
     <PackageReference Include="Akka.TestKit.Xunit2" Version="$(AkkaVersion)" />

src/Examples/Akka.Hosting.LoggingDemo/Akka.Hosting.LoggingDemo.csproj

@@ -11,7 +11,7 @@
     </ItemGroup>
 
     <ItemGroup>
-      <PackageReference Include="Akka.Logger.Serilog" Version="1.5.12.1" />
+      <PackageReference Include="Akka.Logger.Serilog" Version="1.5.25" />
       <PackageReference Include="Serilog.Sinks.Console" Version="6.0.0" />
     </ItemGroup>
 </Project>