Bump MediatR from 12.5.0 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]

Directory.Packages.props

@@ -16,7 +16,7 @@
     <PackageVersion Include="FastEndpoints.Swagger" Version="6.2.0" />
     <PackageVersion Include="FastEndpoints.Swagger.Swashbuckle" Version="2.2.0" />
     <PackageVersion Include="MailKit" Version="4.13.0" />
-    <PackageVersion Include="MediatR" Version="12.5.0" />
+    <PackageVersion Include="MediatR" Version="13.0.0" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.6" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.InMemory" Version="9.0.6" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.Relational" Version="9.0.6" />