Update KotlinX Serialization to version 1.5.1

https://github.com/Kotlin/kotlinx.serialization/releases/tag/v1.5.1

> ### Bugfixes
> - KeyValueSerializer: Fix missing call to endStructure() (#2272)
> - ObjectSerializer: Respect sequential decoding (#2273)
> - Fix value class encoding in various corner cases (#2242)
> - Fix incorrect json decoding iterator's .hasNext() behavior on array-wrapped inputs (#2268)
> - Fix memory leak caused by invalid KTypeWrapper's equals method (#2274)
> - Fixed NoSuchMethodError when parsing a JSON stream on Java 8 (#2219)
> - Fix MissingFieldException duplication (#2213)

Author: SimonMarquis

gradle/libs.versions.toml

@@ -42,7 +42,7 @@ junit4 = "4.13.2"
 kotlin = "1.8.20"
 kotlinxCoroutines = "1.6.4"
 kotlinxDatetime = "0.4.0"
-kotlinxSerializationJson = "1.5.0"
+kotlinxSerializationJson = "1.5.1"
 ksp = "1.8.20-1.0.11"
 lint = "30.3.1"
 okhttp = "4.10.0"