Increase Zipkin perf test memory limit to avoid failures (#1757)
Increase Zipkin perf test memory limit to avoid failures (#1757)

Zipkin appears to need more memory and randomly fails sometimes, e.g.:
https://app.circleci.com/pipelines/github/open-telemetry/opentelemetry-collector/3370/workflows/73f553df-16ba-40f4-aa04-8f01968b2728/jobs/34445
open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector-contrib