build(deps): bump Serilog.Sinks.Splunk in /oauth-server/src/API

Bumps [Serilog.Sinks.Splunk](https://github.com/serilog/serilog-sinks-splunk) from 5.0.1 to 5.1.0.
- [Release notes](https://github.com/serilog/serilog-sinks-splunk/releases)
- [Changelog](https://github.com/serilog-contrib/serilog-sinks-splunk/blob/dev/CHANGES.md)
- [Commits](serilog-contrib/serilog-sinks-splunk@5.0.1...5.1.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

oauth-server/src/API/OAuthServer/OAuthServer.csproj

@@ -32,7 +32,7 @@
         <PackageReference Include="Serilog.Enrichers.Span" Version="3.1.0" />
         <PackageReference Include="Serilog.Exceptions" Version="8.4.0" />
         <PackageReference Include="Serilog.Sinks.Console" Version="6.0.0" />
-        <PackageReference Include="Serilog.Sinks.Splunk" Version="5.0.1" />
+        <PackageReference Include="Serilog.Sinks.Splunk" Version="5.1.0" />
     </ItemGroup>