downgrade kotlin and fix build

startup/plugin/src/jvmMain/kotlin/StartPluginSerializer.jvm.kt

@@ -0,0 +1,17 @@
+package dev.inmo.micro_utils.startup.plugin
+
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+
+internal actual fun alternativeDeserialize(decoder: Decoder): StartPlugin? {
+    val kclass = Class.forName(decoder.decodeString()).kotlin
+    return (kclass.objectInstance ?: kclass.constructors.first { it.parameters.isEmpty() }.call()) as StartPlugin
+}
+
+internal actual fun alternativeSerialize(
+    encoder: Encoder,
+    value: StartPlugin
+): Boolean {
+    encoder.encodeString(value::class.java.canonicalName ?: return false)
+    return true
+}

startup/plugin/src/jvmMain/kotlin/StartPluginSerializer.kt

@@ -1,23 +0,0 @@
-package dev.inmo.micro_utils.startup.plugin
-
-import kotlinx.serialization.KSerializer
-import kotlinx.serialization.builtins.serializer
-import kotlinx.serialization.descriptors.SerialDescriptor
-import kotlinx.serialization.encoding.Decoder
-import kotlinx.serialization.encoding.Encoder
-
-actual object StartPluginSerializer : KSerializer<StartPlugin> {
-    override val descriptor: SerialDescriptor
-    get() = String.serializer().descriptor
-
-    override fun deserialize(decoder: Decoder): StartPlugin {
-        val kclass = Class.forName(decoder.decodeString()).kotlin
-        return (kclass.objectInstance ?: kclass.constructors.first { it.parameters.isEmpty() }.call()) as StartPlugin
-    }
-
-    override fun serialize(encoder: Encoder, value: StartPlugin) {
-        encoder.encodeString(
-            value::class.java.canonicalName
-        )
-    }
-}