Update dependency @fedify/fedify to v1.5.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@fedify/fedify (source)	1.5.0 -> 1.5.1

---

Release Notes

fedify-dev/fedify (@​fedify/fedify)

v1.5.1

Compare Source

Released on April 8, 2025.

• Activity Vocabulary API became to accept [RFC 3339] date-time strings
  without a timezone offset. This is not a bug fix, but improves
  interoperability with some implementations that do not include a timezone
  offset in their date-time strings including WordPress. [[#​226]]

• Added the following default context to Undo class:

  {
    "litepub": "http://litepub.social/ns#",
    "toot": "http://joinmastodon.org/ns#",
    "EmojiReact": "litepub:EmojiReact",
    "Emoji": "toot:Emoji"
  }

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - "* 17-23 * * 5,* * * * 0,6,* 0-12 * * 1" (UTC).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Never, 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.