Bump SteamKit2 from 3.3.0 to 3.3.1 (#668)

---
updated-dependencies:
- dependency-name: SteamKit2
  dependency-version: 3.3.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

DepotDownloader/DepotDownloader.csproj

@@ -27,6 +27,6 @@
     </PackageReference>
     <PackageReference Include="protobuf-net" Version="3.2.56" />
     <PackageReference Include="QRCoder" Version="1.7.0" />
-    <PackageReference Include="SteamKit2" Version="3.3.0" />
+    <PackageReference Include="SteamKit2" Version="3.3.1" />
   </ItemGroup>
 </Project>