Bump SteamKit2 from 2.3.0-beta.2 to 2.3.0

Bumps [SteamKit2](https://github.com/SteamRE/SteamKit) from 2.3.0-beta.2 to 2.3.0.
- [Release notes](https://github.com/SteamRE/SteamKit/releases)
- [Commits](https://github.com/SteamRE/SteamKit/compare/2.3.0-beta.2...2.3.0)

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

DepotDownloader/DepotDownloader.csproj

@@ -6,6 +6,6 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="protobuf-net" Version="2.4.6" />
-    <PackageReference Include="SteamKit2" Version="2.3.0-beta.2" />
+    <PackageReference Include="SteamKit2" Version="2.3.0" />
   </ItemGroup>
 </Project>