chore(deps): update rust crate gray_matter to 0.3.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
gray_matter	build-dependencies	minor	0.2.6 → 0.3.0

---

Release Notes

the-alchemists-of-arland/gray-matter-rs (gray_matter)

v0.3.2

Breaking changes

• The Matter::parse_with_struct method has been removed. Instead, you can now use the parse method with
  a struct that implements the Deserialize trait from the serde crate.
• Expose gray_matter::Error to allow engine parsing errors to be handled by the user.

Enhancements

• Implement Deserializer for Pod. No json::Value conversion is needed anymore.

---

Configuration

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