build: Bump System.Net.Http.Json from 8.0.1 to 9.0.8

---
updated-dependencies:
- dependency-name: System.Net.Http.Json
  dependency-version: 9.0.8
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

APIMatic.Core.Test/APIMatic.Core.Test.csproj

@@ -19,7 +19,7 @@
         <PackageReference Include="NUnit" Version="3.13.3" />
         <PackageReference Include="NUnit3TestAdapter" Version="4.3.1" />
         <PackageReference Include="RichardSzalay.MockHttp" Version="6.0.0" />
-        <PackageReference Include="System.Net.Http.Json" Version="8.0.1" />
+        <PackageReference Include="System.Net.Http.Json" Version="9.0.8" />
     </ItemGroup>
 
     <ItemGroup>