Bump MediatR from 12.4.1 to 13.0.0

---
updated-dependencies:
- dependency-name: MediatR
  dependency-version: 13.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

code/Directory.Packages.props

@@ -8,7 +8,7 @@
   <ItemGroup>
     <PackageVersion Include="Ardalis.GuardClauses" Version="5.0.0" />
     <PackageVersion Include="FluentValidation.AspNetCore" Version="11.3.0" />
-    <PackageVersion Include="MediatR" Version="12.4.1" />
+    <PackageVersion Include="MediatR" Version="13.0.0" />
     <PackageVersion Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="9.0.3" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.2" />
     <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="9.0.3" />