ci: Update pnpm/action-setup action to v6.0.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	Pending
pnpm/action-setup	action	patch	v6.0.1 → v6.0.3	v6.0.4

---

Release Notes

pnpm/action-setup (pnpm/action-setup)

v6.0.3

Compare Source

Updated pnpm to v11.0.0-rc.5

Full Changelog: pnpm/action-setup@v6.0.2...v6.0.3

v6.0.2

Compare Source

What's Changed

• fix: pnpm self-update binary shadowed by bootstrap on PATH by @​oniani1 in #​230

New Contributors

• @​oniani1 made their first contribution in #​230

Full Changelog: pnpm/action-setup@v6.0.1...v6.0.2

---

Configuration

📅 Schedule: (in timezone Asia/Tokyo)

• Branch creation
  • "every weekend"
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.