Update `net.logstash.logback:logstash-logback-encoder` to `v7.4` (was `7.3`)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
net.logstash.logback:logstash-logback-encoder	7.3 -> 7.4

---

Configuration

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

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

♻ 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.

[ihostage]

Block details in #621