Temporary fix: Override Kotlin version in the plugin module

Fixes issue #236.
Eventually, the plugin should use the version of Kotlin embedded into Gradle.

plugin/settings.gradle.kts

@@ -10,6 +10,14 @@ dependencyResolutionManagement {
     versionCatalogs {
         create("libs") {
             from(files("../gradle/libs.versions.toml"))
+
+            String kotlinVersion = providers.gradleProperty("kotlin_version").orNull
+            if (kotlinVersion != null && !kotlinVersion.isBlank()) {
+                // Override the default Kotlin version.
+                // The only intended use-case is for testing dev Kotlin builds using kotlinx-benchmark.
+                // The Kotlin version should not be overridden during regular development.
+                version("kotlin", kotlinVersion)
+            }
         }
     }
 }