Update kotlinx.serialization to v1.7.3

Author: renovate[bot]

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ dokka = "1.9.10"
 dokkatoo = "2.4.0"
 
 kotlin = "1.9.25"
-kotlinx-serialization = "1.6.3"
+kotlinx-serialization = "1.7.3"
 
 kotest = "5.9.1"
 kotest-propertyArbsExtension = "2.1.2"