chore: gRPC intrumentation: plug in Dependabot, update Readme and Changelog#1399

kaylareopelle merged 7 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-ruby-contrib:mainfrom

michal-kazmierczak:grpc-intrumentation-plug-dependabot-and-update-readmemichal-kazmierczak/opentelemetry-ruby-contrib:grpc-intrumentation-plug-dependabot-and-update-readmeCopy head branch name to clipboard