Bump go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc from 1.27.0 to 1.28.0

Bump go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc from 1.27.0 to 1.28.0 #165