Bump protobuf-net and SteamKit2

Bumps [protobuf-net](https://github.com/protobuf-net/protobuf-net) and [SteamKit2](https://github.com/SteamRE/SteamKit). These dependencies needed to be updated together.

Updates `protobuf-net` from 3.2.46 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)

Updates `SteamKit2` from 3.0.1 to 3.0.2
- [Release notes](https://github.com/SteamRE/SteamKit/releases)
- [Commits](SteamRE/SteamKit@3.0.1...3.0.2)

---
updated-dependencies:
- dependency-name: protobuf-net
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: SteamKit2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

DepotDownloader/DepotDownloader.csproj

@@ -27,6 +27,6 @@
     </PackageReference>
     <PackageReference Include="protobuf-net" Version="3.2.46" />
     <PackageReference Include="QRCoder" Version="1.6.0" />
-    <PackageReference Include="SteamKit2" Version="3.0.1" />
+    <PackageReference Include="SteamKit2" Version="3.0.2" />
   </ItemGroup>
 </Project>