Update dependency org.jetbrains.kotlinx:kotlinx-serialization-json to v1.8.1 (#413)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[org.jetbrains.kotlinx:kotlinx-serialization-json](https://redirect.github.com/Kotlin/kotlinx.serialization)
| `1.8.0` -> `1.8.1` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/org.jetbrains.kotlinx:kotlinx-serialization-json/1.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/org.jetbrains.kotlinx:kotlinx-serialization-json/1.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/org.jetbrains.kotlinx:kotlinx-serialization-json/1.8.0/1.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/org.jetbrains.kotlinx:kotlinx-serialization-json/1.8.0/1.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>Kotlin/kotlinx.serialization
(org.jetbrains.kotlinx:kotlinx-serialization-json)</summary>

###
[`v1.8.1`](https://redirect.github.com/Kotlin/kotlinx.serialization/blob/HEAD/CHANGELOG.md#181--2025-03-31)

\==================

This release updates Kotlin version to 2.1.20, while also providing
several important improvements
and bugfixes.

#### Improvements

- Implemented encoding null in key and value of a map in Protobuf
([#&#8203;2910](https://redirect.github.com/Kotlin/kotlinx.serialization/issues/2910))
- Make type argument in JsonTransformingSerializer nullable
([#&#8203;2911](https://redirect.github.com/Kotlin/kotlinx.serialization/issues/2911))
- Use SPDX identifier in POMs
([#&#8203;2936](https://redirect.github.com/Kotlin/kotlinx.serialization/issues/2936))
(thanks to [Leon Linhart](https://redirect.github.com/TheMrMilchmann))
- Add watchosDeviceArm64 to Okio integration module
([#&#8203;2920](https://redirect.github.com/Kotlin/kotlinx.serialization/issues/2920))
(thanks to [Daniel Santiago](https://redirect.github.com/danysantiago))
- Update kotlinx-io version to 0.6.0
([#&#8203;2933](https://redirect.github.com/Kotlin/kotlinx.serialization/issues/2933))
(thanks to [Piotr Krzemiński](https://redirect.github.com/krzema12))

#### Bugfixes

- Fix incorrect enum coercion during deserialization from JsonElement
([#&#8203;2962](https://redirect.github.com/Kotlin/kotlinx.serialization/issues/2962))
- Supply proper equals(), hashCode(), and toString() for
SerialDescriptor() wrapper
([#&#8203;2942](https://redirect.github.com/Kotlin/kotlinx.serialization/issues/2942))
- Do not encode empty packed collections in protobuf
([#&#8203;2907](https://redirect.github.com/Kotlin/kotlinx.serialization/issues/2907))

</details>

---

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---

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---

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android/gradle/libs.versions.toml

@@ -12,7 +12,7 @@ lifecycleRuntimeKtx = "2.8.7"
 activityCompose = "1.10.1"
 retrofit = "2.11.0"
 okhttp = "4.12.0"
-kotlinx-serialization-json = "1.8.0"
+kotlinx-serialization-json = "1.8.1"
 viewmodel = "2.8.7"
 navigation = "2.8.9"
 browser = "1.8.0"