Bump opentelemetry-semconv from 1.17.0-alpha to 1.21.0-alpha#21

dependabot[bot] wants to merge 1 commit intomainbocytko/riptide:mainfrom

dependabot/maven/io.opentelemetry-opentelemetry-semconv-1.21.0-alphabocytko/riptide:dependabot/maven/io.opentelemetry-opentelemetry-semconv-1.21.0-alphaCopy head branch name to clipboard