Bump protobuf-net from 3.2.45 to 3.2.46 in /SteamKit2

Bumps [protobuf-net](https://github.com/protobuf-net/protobuf-net) from 3.2.45 to 3.2.46.
- [Release notes](https://github.com/protobuf-net/protobuf-net/releases)
- [Changelog](https://github.com/protobuf-net/protobuf-net/blob/main/docs/releasenotes.md)
- [Commits](https://github.com/protobuf-net/protobuf-net/commits)

---
updated-dependencies:
- dependency-name: protobuf-net
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

SteamKit2/SteamKit2/SteamKit2.csproj

@@ -53,7 +53,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="protobuf-net" Version="3.2.45" />
+    <PackageReference Include="protobuf-net" Version="3.2.46" />
     <PackageReference Include="System.IO.Hashing" Version="9.0.0" />
   </ItemGroup>