Bump System.Text.Json from 8.0.0 to 9.0.1 (#272)

Bumps [System.Text.Json](https://github.com/dotnet/runtime) from 8.0.0 to 9.0.1.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.0...v9.0.1)

---
updated-dependencies:
- dependency-name: System.Text.Json
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: MihailsKuzmins <47413092+MihailsKuzmins@users.noreply.github.com>

Author: dependabot[bot]

src/MyNihongo.FluentHttp.csproj

@@ -27,7 +27,7 @@
 	</ItemGroup>
 
 	<ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.1'">
-		<PackageReference Include="System.Text.Json" Version="8.0.0" />
+		<PackageReference Include="System.Text.Json" Version="9.0.1" />
 	</ItemGroup>
 
 	<ItemGroup>

tests/MyNihongo.FluentHttp.Tests.Integration/MyNihongo.FluentHttp.Tests.Integration.csproj

@@ -9,7 +9,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="FluentAssertions" Version="[7.2.0]" />
-		<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />
+		<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="9.0.0" />
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
 		<PackageReference Include="Serilog.Extensions.Logging" Version="8.0.0" />