Revert "Bump kotlin.version from 1.9.24 to 2.0.0 (#512)"

This reverts commit 48443a8.

Author: DreamVoid

MiraiMC-Base/pom.xml

@@ -14,7 +14,7 @@
     <properties>
         <maven.compiler.source>8</maven.compiler.source>
         <maven.compiler.target>8</maven.compiler.target>
-        <kotlin.version>2.0.0</kotlin.version>
+        <kotlin.version>1.9.24</kotlin.version>
         <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
     </properties>