Update dependency dev.drewhamilton.poko:poko-gradle-plugin to v0.15.0

gradle/libs.versions.toml

@@ -23,7 +23,7 @@ picocli = "info.picocli:picocli:4.7.4"
 logging = "io.github.oshai:kotlin-logging-jvm:5.0.2"
 slf4j = "org.slf4j:slf4j-simple:2.0.7"
 # TODO: update to 0.14.0 after upgrade to Kotlin Gradle Plugin 1.9
-poko = "dev.drewhamilton.poko:poko-gradle-plugin:0.14.0"
+poko = "dev.drewhamilton.poko:poko-gradle-plugin:0.15.0"
 # Use logback-classic as the logger for kotlin-logging / slf4j as it allow changing the log level at runtime.
 logback = "ch.qos.logback:logback-classic:1.3.5"
 # Required for logback.xml conditional configuration