Update dependency org.jetbrains.kotlin:kotlin-gradle-plugin to v2.3.20

Author: renovate[bot]

gradle/buildLibs.versions.toml

@@ -2,7 +2,7 @@
 bc-validator = "0.18.1"
 dokka = "1.9.20"
 jacocoTool = "0.8.9"
-kotlin = "2.0.21"
+kotlin = "2.3.20"
 task-tree = "4.0.1"
 tutteli = "5.0.3"
 vlsi = "3.0.1"