Bump libsignal-protocol to 2.6.2.1

Author: Trolldemorted

libsignal-service-dotnet/libsignal-service-dotnet.csproj

@@ -29,7 +29,7 @@
     <PackageReference Include="Google.Protobuf" Version="3.5.1" />
     <PackageReference Include="Google.Protobuf.Tools" Version="3.5.1" />
     <PackageReference Include="libphonenumber-csharp" Version="8.8.6" />
-    <PackageReference Include="libsignal-protocol-dotnet" Version="2.6.2" />
+    <PackageReference Include="libsignal-protocol-dotnet" Version="2.6.2.1" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="1.1.2" />
     <PackageReference Include="Newtonsoft.Json" Version="11.0.1" />
     <PackageReference Include="Portable.BouncyCastle" Version="1.8.2" />