Bump GraphQL.Client.Serializer.SystemTextJson in /src

Bumps [GraphQL.Client.Serializer.SystemTextJson](https://github.com/graphql-dotnet/graphql-client) from 6.0.1 to 6.1.0. - [Release notes](https://github.com/graphql-dotnet/graphql-client/releases) - [Commits](graphql-dotnet/graphql-client@v6.0.1...v6.1.0) --- updated-dependencies: - dependency-name: GraphQL.Client.Serializer.SystemTextJson dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -11,7 +11,7 @@
  <PackageVersion Include="coverlet.msbuild" Version="6.0.4" />
  <PackageVersion Include="Destructurama.Attributed" Version="5.1.0" />
  <PackageVersion Include="GraphQL.Client" Version="6.0.1" />
- <PackageVersion Include="GraphQL.Client.Serializer.SystemTextJson" Version="6.0.1" />
+ <PackageVersion Include="GraphQL.Client.Serializer.SystemTextJson" Version="6.1.0" />
  <PackageVersion Include="IDisposableAnalyzers" Version="4.0.8" />
  <PackageVersion Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="9.0.0" />
  <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="9.0.3" />