chore(deps): update module go.opentelemetry.io/build-tools to v0.21.0#2053

MrAlias merged 2 commits intomainopen-telemetry/opentelemetry-go-instrumentation:mainfrom

renovate/go.opentelemetry.io-build-tools-0.xopen-telemetry/opentelemetry-go-instrumentation:renovate/go.opentelemetry.io-build-tools-0.xCopy head branch name to clipboard