fix(deps): update rust crate fern to 0.6.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
fern	dependencies	patch	0.6.1 -> 0.6.2

---

Release Notes

daboross/fern

v0.6.2

Compare Source

==================

• Add security warning for "colored" feature when using a global allocator
  to doc homepage and README.md. See
  fern-0.6.2 README.md
• Change examples to use env_logger-style formatting
• Improve main documentation example explanation
• Misc. style improvements (clippy lint fixes which have no functional change)

---

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 has been generated by Mend Renovate. View repository job log here.