build(java): upgrade scala to 2.12.18 (#3623)

metals support scala >= 2.12.11

Author: aceforeverd

java/pom.xml

@@ -50,7 +50,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <scala.version>2.12.8</scala.version>
+        <scala.version>2.12.15</scala.version>
         <scala.binary.version>2.12</scala.binary.version>
         <spark.version>3.2.1</spark.version>
         <hadoop.version>3.3.1</hadoop.version>