go.mk: upgrade to v2.0.3 · exoscale/cert-manager-webhook-exoscale@1d72dc0

cert.init calls os.Getenv, which eventually calls otelgrpc.StreamClientInterceptor

cert.init calls os.Getenv, which eventually calls otelgrpc.UnaryClientInterceptor

cert.init calls os.Getenv, which eventually calls otelgrpc.spanInfo