This package requires a lot of golang dependencies.

2023-09-14:
We could use the Debian packages but there are a lot of incompatibilities
between current Debian packages (especially golang-google-protobuf-dev and
golang-google-grpc-dev). These packages are used by several dependencies.
If we use the Debian packages it breaks several other dependencies and
spire code.
I decided to embed all the required dependencies in debian/vendor for the
moment. 
