🔒 Pin GitHub Actions to commit SHAs (#2215)
* 🔒 pin build-image.yml actions to commit SHAs
* 🔒 pin slugify.yaml actions to commit SHAs
* 🔒 pin deploy-prod.yml actions to commit SHAs
* 🔒 pin build-docs.yml actions to commit SHAs
* 🔒 pin build-pr-docs.yml actions to commit SHAs
* 🔒 pin upload-pr-documentation.yml actions to commit SHAs
* 🔒 pin trufflehog.yml actions to commit SHAs
