Use c++17 for the json stub compilation

update changelog

Use pkg-config (discover) when linking against libprotobuf

Accept ci failures for oraclelinux-9

Remove unneeded reference to Caml standard library for tests

- Emit modules for service endpoints with request/reply and gRPC

  endpoint name (thanks @Nymphium)
- Support importing from proto files with `-` in their name.

Update change in preperation for 4.3.1 release

Release 4.3.0

Add doc field to opam package

Release 4.1.0