Bump github.com/docker/buildx from 0.15.1 to 0.21.3 in /quickstarttest#68

dependabot[bot] wants to merge 1 commit intomainGoogleCloudPlatform/opentelemetry-operations-e2e-testing:mainfrom

dependabot/go_modules/quickstarttest/github.com/docker/buildx-0.21.3GoogleCloudPlatform/opentelemetry-operations-e2e-testing:dependabot/go_modules/quickstarttest/github.com/docker/buildx-0.21.3Copy head branch name to clipboard