Bump Google.Protobuf from 3.28.2 to 3.28.3 in /src/net (#702)

Bumps [Google.Protobuf](https://github.com/protocolbuffers/protobuf) from 3.28.2 to 3.28.3.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v3.28.2...v3.28.3)

---
updated-dependencies:
- dependency-name: Google.Protobuf
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/net/KNet.Serialization.Protobuf/KNet.Serialization.Protobuf.csproj

@@ -18,7 +18,7 @@
 		<None Include="..\..\documentation\articles\usageSerDes.md" Pack="true" PackagePath="\" />
 	</ItemGroup>
 	<ItemGroup>
-	  <PackageReference Include="Google.Protobuf" Version="3.28.2" />
+	  <PackageReference Include="Google.Protobuf" Version="3.28.3" />
 	  <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0">
 	    <PrivateAssets>all</PrivateAssets>
 	    <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>