Bump CommunityToolkit.Mvvm from 8.3.2 to 8.4.0 in /TimVer

Bumps [CommunityToolkit.Mvvm](https://github.com/CommunityToolkit/dotnet) from 8.3.2 to 8.4.0.
- [Release notes](https://github.com/CommunityToolkit/dotnet/releases)
- [Commits](CommunityToolkit/dotnet@v8.3.2...v8.4.0)

---
updated-dependencies:
- dependency-name: CommunityToolkit.Mvvm
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

TimVer/TimVer.csproj

@@ -33,7 +33,7 @@
   <!-- Packages -->
   <ItemGroup>
     <PackageReference Include="CommandLineArgumentsParser" Version="3.0.23" />
-    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.3.2" />
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.0" />
     <PackageReference Include="MaterialDesignThemes" Version="5.1.0" />
     <PackageReference Include="Microsoft.Management.Infrastructure" Version="3.0.0" />
     <PackageReference Include="Nerdbank.GitVersioning" Version="3.7.112" PrivateAssets="all" />