add missing bouncy castle dep - how was this possible

Author: TYoungSL

StirlingLabs.MsQuic/StirlingLabs.MsQuic.csproj

@@ -20,6 +20,7 @@
 
     <ItemGroup>
         <PackageReference Include="JetBrains.Annotations" Version="2022.1.0" PrivateAssets="all" />
+        <PackageReference Include="Portable.BouncyCastle" Version="1.9.0" />
         <PackageReference Include="sockaddr.Net" Version="22.3.0" />
         <PackageReference Include="StirlingLabs.Utilities" Version="22.4.6" />
         <PackageReference Include="System.Collections.Immutable" Version="6.0.0" />