chore(deps): update dependency mediatr to v12.3.0 (#854)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [MediatR](https://github.com/jbogard/MediatR) | `12.2.0` -> `12.3.0`
|
[![age](https://developer.mend.io/api/mc/badges/age/nuget/MediatR/12.3.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/MediatR/12.3.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/MediatR/12.2.0/12.3.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/MediatR/12.2.0/12.3.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>jbogard/MediatR (MediatR)</summary>

###
[`v12.3.0`](https://github.com/jbogard/MediatR/releases/tag/v12.3.0)

#### What's Changed

- Fix AutoRegisterRequestProcessors to include all implementations by
[@&#8203;hisuwh](https://github.com/hisuwh) in
[https://github.com/jbogard/MediatR/pull/989](https://github.com/jbogard/MediatR/pull/989)
- [#&#8203;1016](https://github.com/jbogard/MediatR/issues/1016) Use
repo readme for base package by
[@&#8203;thompson-tomo](https://github.com/thompson-tomo) in
[https://github.com/jbogard/MediatR/pull/1017](https://github.com/jbogard/MediatR/pull/1017)
- Add Support for Generic Handlers by
[@&#8203;zachpainter77](https://github.com/zachpainter77) in
[https://github.com/jbogard/MediatR/pull/1013](https://github.com/jbogard/MediatR/pull/1013)

#### New Contributors

- [@&#8203;hisuwh](https://github.com/hisuwh) made their first
contribution in
[https://github.com/jbogard/MediatR/pull/989](https://github.com/jbogard/MediatR/pull/989)
- [@&#8203;thompson-tomo](https://github.com/thompson-tomo) made their
first contribution in
[https://github.com/jbogard/MediatR/pull/1017](https://github.com/jbogard/MediatR/pull/1017)
- [@&#8203;zachpainter77](https://github.com/zachpainter77) made their
first contribution in
[https://github.com/jbogard/MediatR/pull/1013](https://github.com/jbogard/MediatR/pull/1013)

**Full Changelog**:
jbogard/MediatR@v12.2.0...v12.3.0

</details>

---

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src/Digdir.Domain.Dialogporten.Application/Digdir.Domain.Dialogporten.Application.csproj

@@ -12,7 +12,7 @@
         <PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.0" />
         <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="8.0.0" />
         <PackageReference Include="FluentValidation.DependencyInjectionExtensions" Version="11.9.1" />
-        <PackageReference Include="MediatR" Version="12.2.0" />
+        <PackageReference Include="MediatR" Version="12.3.0" />
         <PackageReference Include="Npgsql" Version="8.0.3" />
         <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="8.0.4" />
         <PackageReference Include="NSec.Cryptography" Version="24.4.0" />