Checking PR #29955: stress-ng: update to 0.21.03 (Formalities Audit)

✅ Pull request originates from a dedicated feature branch (stress-ng)

Commit 91b090e - stress-ng: update to 0.21.03:

✅ Author and committer identities are valid
✅ Commit is not a merge commit
✅ Commit subject layout and length are valid: "stress-ng: update to 0.21.03"
✅ Commit description lines adhere to width formatting rules
✅ Commit contains a consistent and valid 'Signed-off-by:' line
⚠️ Warning: No reference link (e.g., upstream release notes, changelog, or history URL) detected in description.
⚠️ Warning: Commit is unsigned or cryptographic signature verification failed (Reason: unsigned). Signing commits is a recommended best practice for verifying identity, but is not mandatory.