Bump go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp from 1.26.0 to 1.27.0 in /impl

Bump go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp from 1.26.0 to 1.27.0 in /impl #31