3.39.21

What's Changed

• Add QA bot Slack notification workflow by @melohagan in #19042
• build(deps): bump js-yaml from 4.2.0 to 5.0.0 by @dependabot[bot] in #19041
• build(deps): bump undici from 6.24.1 to 6.27.0 by @dependabot[bot] in #19035
• enhance: Add space-around alignment option to FlexContainer by @NDCallahan in #19016
• 18977 automation agent step doesnt seem to ever return an output causing the automation to error by @Dakuan in #19044

Full Changelog: 3.39.20...3.39.21