The code generator for the php language doesn't work with proto2. We were able to generate php code required in the SDK until protovalidate migrated from proto3 to proto2 in bufbuild/protovalidate#246.

Communicating with the buf team, I've learned a new feature exclude_types to be introduced which basically excludes any types you specified with it.

Updated buf.gen.yaml with exclude_types:

version: v2

plugins:
  - remote: buf.build/protocolbuffers/php:v30.2
    out: ./src
    exclude_types:
      - buf.validate

  - remote: buf.build/grpc/php:v1.71.0
    out: ./src
    exclude_types:
      - buf.validate

Also this PR updates some dependencies and introduces support for php 8.4 while removing support for php 8.3.