[jpmcb]

Bump Dagger engine to v0.21.8 (latest, 2026-07-29) and dagger/dagger-for-github to v8.4.1.

Refs PCC-544

[greptile-apps]

Greptile Summary

Updates the Dagger engine and CI CLI to v0.21.8 and upgrades the GitHub installer action to v8.4.1.

• Aligns the workflow-installed Dagger CLI with the configured engine version.
• Applies the installer-action upgrade to both pull-request validation jobs.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete blocking or independently actionable non-blocking issue identified.

The workflow uses the requested Dagger CLI through the upgraded installer action in both jobs, and the engine configuration is aligned to the same release.

Important Files Changed

Filename	Overview
.github/workflows/pr.yaml	Upgrades the Dagger CLI and installer action consistently across both PR validation jobs; no actionable defect was established.
dagger.json	Raises the module engine version to v0.21.8; the older Go SDK pin warrants routine synchronization but no concrete incompatibility was established.

_{Reviews (1): Last reviewed commit: "chore: bump Dagger to 0.21.8" | Re-trigger Greptile}

[linear-code]

PCC-544