Bump kotlin from 2.3.21 to 2.4.0 (#108)

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Author: dependabot[bot]

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ errorprone = "2.49.0"
 errorprone-plugin = "5.1.0"
 idea-ext = "1.4.1"
 jspecify = "1.0.0"
-kotlin = "2.3.21"
+kotlin = "2.4.0"
 nmcp = "1.5.0"
 nullaway = "0.13.4"
 problem4j-core = "2.0.0"