Bump CloudNative.CloudEvents.SystemTextJson from 2.3.0 to 2.3.1 (#89)

Bumps [CloudNative.CloudEvents.SystemTextJson](https://github.com/cloudevents/sdk-csharp) from 2.3.0 to 2.3.1.
- [Release notes](https://github.com/cloudevents/sdk-csharp/releases)
- [Changelog](https://github.com/cloudevents/sdk-csharp/blob/main/docs/changes-since-1x.md)
- [Commits](cloudevents/sdk-csharp@CloudNative.CloudEvents.All-2.3.0...v2.3.1)

---
updated-dependencies:
- dependency-name: CloudNative.CloudEvents.SystemTextJson
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

tests/FaluSdk.Tests/FaluSdk.Tests.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="CloudNative.CloudEvents.SystemTextJson" Version="2.3.0" />
+    <PackageReference Include="CloudNative.CloudEvents.SystemTextJson" Version="2.3.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.2.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.analyzers" Version="0.10.0" />