Bump CSharpier.Core, System.Text.Encodings.Web and System.Text.Json

Bumps [CSharpier.Core](https://github.com/belav/csharpier), [System.Text.Encodings.Web](https://github.com/dotnet/runtime) and [System.Text.Json](https://github.com/dotnet/runtime). These dependencies needed to be updated together.

Updates `CSharpier.Core` from 0.30.2 to 0.30.3
- [Release notes](https://github.com/belav/csharpier/releases)
- [Changelog](https://github.com/belav/csharpier/blob/main/CHANGELOG.md)
- [Commits](belav/csharpier@0.30.2...0.30.3)

Updates `System.Text.Encodings.Web` from 8.0.0 to 8.0.0
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.0...v8.0.0)

Updates `System.Text.Json` from 8.0.5 to 8.0.5
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.5...v8.0.5)

---
updated-dependencies:
- dependency-name: CSharpier.Core
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: System.Text.Encodings.Web
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: System.Text.Json
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/ApiGenerator/ApiGenerator.csproj

@@ -9,7 +9,7 @@
     <PreserveCompilationContext>true</PreserveCompilationContext>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="CSharpier.Core" Version="0.30.2" />
+    <PackageReference Include="CSharpier.Core" Version="0.30.3" />
     <PackageReference Include="Glob" Version="1.1.9" />
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.1" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />