Update dependency org.jetbrains.kotlinx:kotlinx-serialization-json to v1.8.1

| datasource | package                                          | from  | to    |
| ---------- | ------------------------------------------------ | ----- | ----- |
| maven      | org.jetbrains.kotlinx:kotlinx-serialization-json | 1.7.3 | 1.8.1 |

Author: renovate[bot]

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 junit = "4.13.2"
 kotlin = "2.0.21"
 coroutines = "1.9.0"
-kotlinx-serialization-json = "1.7.3"
+kotlinx-serialization-json = "1.8.1"
 kotlinx-collections-immutable = "0.3.8"
 
 # the Java version that the Java and Kotlin compilers will target

standalone-sample/kmpviewmodel_compose_koin_sample/gradle/libs.versions.toml

@@ -5,7 +5,7 @@ java-target = "11"
 # the Java version that is used to run the Java and Kotlin compilers and various other tasks
 java-toolchain = "21"
 coroutines = "1.9.0"
-kotlinx-serialization-json = "1.7.3"
+kotlinx-serialization-json = "1.8.1"
 kotlinx-collections-immutable = "0.3.8"
 
 # the Android minSdkVersion to use