Update dependency org.jetbrains.kotlinx:kotlinx-serialization-json to v1.7.3 (#511)

Author: nedtwigg

jvm/gradle.properties

@@ -8,6 +8,6 @@ ver_JUNIT_USE=5.10.3
 ver_JUNIT_PIONEER=2.2.0
 ver_OKIO=3.9.0
 ver_KOTLIN_TEST=2.0.0
-ver_KOTLIN_SERIALIZATION=1.7.1
+ver_KOTLIN_SERIALIZATION=1.7.3
 # Kotest 5.4.0 is the oldest that we support
 ver_KOTEST=5.4.0