opentelemetry-opamp-client 0.4b0

Added

• opentelemetry-opamp-client: allow configuring agent capabilities (#4897)

Changed

• opentelemetry-opamp-client: bump supported protobuf to < 8 (#5151)

Fixed

• Add requests to the opentelemetry-opamp-client dependencies, fixing a ModuleNotFoundError when importing opentelemetry._opamp.client in a fresh environment. (#4930)