chore(deps): update rust crate once_cell to 1.20.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
once_cell	dev-dependencies	minor	1.19 -> 1.20.0

---

Release Notes

matklad/once_cell (once_cell)

### [`v1.20.0`](https://redirect.github.com/matklad/once_cell/blob/HEAD/CHANGELOG.md#1200) [Compare Source](https://redirect.github.com/matklad/once_cell/compare/v1.19.0...v1.20.0) - propagate `critical-section` feature selection into `portable-atomic`; other minor updates [#​260](https://redirect.github.com/matklad/once_cell/pull/260)

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, 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.