build(deps): bump PublicApiGenerator from 10.2.0 to 10.3.0 in /src

Bumps [PublicApiGenerator](https://github.com/PublicApiGenerator/PublicApiGenerator) from 10.2.0 to 10.3.0.
- [Release notes](https://github.com/PublicApiGenerator/PublicApiGenerator/releases)
- [Commits](PublicApiGenerator/PublicApiGenerator@10.2.0...10.3.0)

---
updated-dependencies:
- dependency-name: PublicApiGenerator
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/ReactiveUI.Validation.Tests/ReactiveUI.Validation.Tests.csproj

@@ -15,7 +15,7 @@
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="Xunit.StaFact" Version="1.1.11" />
     <PackageReference Include="Microsoft.Reactive.Testing" Version="5.0.0" />
-    <PackageReference Include="PublicApiGenerator" Version="10.2.0" />
+    <PackageReference Include="PublicApiGenerator" Version="10.3.0" />
     <PackageReference Include="xunit.runner.console" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
     <PackageReference Include="coverlet.msbuild" Version="3.1.0">