fix(deps): update kotlin monorepo to v2.2.21

[nautilus-renovate-0]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlin.plugin.serialization (source)	2.2.20 -> 2.2.21
org.jetbrains.kotlin.android (source)	2.2.20 -> 2.2.21
org.jetbrains.kotlin.jvm (source)	2.2.20 -> 2.2.21
org.jetbrains.kotlin:kotlin-test (source)	2.2.20 -> 2.2.21

---

Configuration

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

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by Renovate Bot.

[github-actions]

Test Results

 20 files  ±0   20 suites  ±0   1s ⏱️ -1s
136 tests ±0  133 ✅ ±0  3 💤 ±0  0 ❌ ±0 
143 runs  ±0  140 ✅ ±0  3 💤 ±0  0 ❌ ±0 

Results for commit 54ab5e8. ± Comparison against base commit 75d234c.