[8.x](backport #5842) build(deps): bump github.com/elastic/opentelemetry-collector-components/connector/signaltometricsconnector from 0.2.1 to 0.3.0

[8.x](backport #5842) build(deps): bump github.com/elastic/opentelemetry-collector-components/connector/signaltometricsconnector from 0.2.1 to 0.3.0 #16586