[BUILD] Update scala 2.12 version to 2.12.18 to support jdk21 (#11666)

Gluten should upgrade the Scala 2.12 version to 2.12.18 to support JDK 21 and align with the Scala version used in Spark 3.5.

Author: liujiayi771

pom.xml

@@ -64,7 +64,7 @@
     <maven.compiler.target>${java.version}</maven.compiler.target>
     <caffeine.version>2.9.3</caffeine.version>
     <scala.binary.version>2.12</scala.binary.version>
-    <scala.version>2.12.15</scala.version>
+    <scala.version>2.12.18</scala.version>
     <scala-xml.version>2.1.0</scala-xml.version>
     <javax.servlet.version>3.1.0</javax.servlet.version>
     <spark.major.version>3</spark.major.version>
@@ -993,7 +993,7 @@
          SPARK-34774 Add this property to ensure change-scala-version.sh can replace the public `scala.version`
          property correctly.
         -->
-        <scala.version>2.12.15</scala.version>
+        <scala.version>2.12.18</scala.version>
         <scala.binary.version>2.12</scala.binary.version>
       </properties>
     </profile>