Bump Mediator.Abstractions from 2.1.5 to 2.1.6

Bumps [Mediator.Abstractions](https://github.com/martinothamar/Mediator) from 2.1.5 to 2.1.6.
- [Release notes](https://github.com/martinothamar/Mediator/releases)
- [Commits](https://github.com/martinothamar/Mediator/commits)

---
updated-dependencies:
- dependency-name: Mediator.Abstractions
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/web/Server/Jordnaer.Server.csproj

@@ -49,7 +49,7 @@
     <PackageReference Include="Serilog.AspNetCore" Version="7.0.0" />
     <PackageReference Include="Serilog.Sinks.Grafana.Loki" Version="8.1.0" />
 
-    <PackageReference Include="Mediator.Abstractions" Version="2.1.5" />
+    <PackageReference Include="Mediator.Abstractions" Version="2.1.6" />
     <PackageReference Include="Mediator.SourceGenerator" Version="2.1.6">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>