fix(deps): update kotlinx.serialization to v1.9.0

Author: rb-org-bot[bot]

gradle/libs.versions.toml

@@ -60,7 +60,7 @@ kotlinx-cli = "0.3.6"
 kotlinx-coroutines = "1.10.2"
 kotlinx-datetime = "0.7.0-0.6.x-compat"
 kotlinx-knit = "0.4.0"
-kotlinx-serialization = "1.8.1"
+kotlinx-serialization = "1.9.0"
 ktlint-lib = "1.5.0"
 mavenPublish = "0.13.0"
 prettier = "2.8.4"