Bump Catel.MVVM and Orc.Controls in /src

Bumps [Catel.MVVM](https://github.com/Catel/Catel) and [Orc.Controls](https://github.com/WildGums/Orc.Controls). These dependencies needed to be updated together.

Updates `Catel.MVVM` from 6.0.4 to 6.0.3
- [Release notes](https://github.com/Catel/Catel/releases)
- [Changelog](https://github.com/Catel/Catel/blob/develop/doc/release%20steps.txt)
- [Commits](Catel/Catel@6.0.4...6.0.3)

Updates `Orc.Controls` from 5.1.0 to 5.1.1
- [Release notes](https://github.com/WildGums/Orc.Controls/releases)
- [Changelog](https://github.com/WildGums/Orc.Controls/blob/develop/GitReleaseManager.yaml)
- [Commits](WildGums/Orc.Controls@5.1.0...5.1.1)

---
updated-dependencies:
- dependency-name: Catel.MVVM
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: Orc.Controls
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

src/Orc.Notifications.Example/Orc.Notifications.Example.csproj

@@ -24,7 +24,7 @@
     </PackageReference>
     <PackageReference Include="LoadAssembliesOnStartup.Fody" Version="4.6.0" PrivateAssets="all" />
     <PackageReference Include="ModuleInit.Fody" Version="2.1.1" PrivateAssets="all" />
-    <PackageReference Include="Orc.Controls" Version="5.1.0" />
+    <PackageReference Include="Orc.Controls" Version="5.1.1" />
     <PackageReference Include="Orchestra.Core" Version="7.0.2" />
   </ItemGroup>