The C# binding bundles `mongocrypt.pdb` when creating a release because the .NET driver also used to include pdb files with the zip file released on GitHub. (e.g. `MongoDB.Bson.dll` would be distributed with `MongoDB.Bson.pdb`). As the .NET driver has stopped releasing on GitHub, and no other drivers seem to release `mongocrypt.pdb` alongside `mongocrypt.dll` for dll, it seems to make sense for the C# bindings to no longer include `mongocrypt.pdb` when releasing.