Update Scala 2.12.x to 2.12.21 + switch CI build from JDK 21 to JDK 25

Author: plokhotnyuk

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
       matrix:
         java:
           - 17
-          - 21
+          - 25
         os:
           - ubuntu-22.04-arm
           - ubuntu-22.04
@@ -36,6 +36,10 @@ jobs:
           fetch-depth: 300
       - name: Fetch tags
         run: git fetch --depth=300 origin +refs/tags/*:refs/tags/*
+      - name: Set JVM options for JDK 25+
+        if: matrix.java >= 25
+        run: echo "JAVA_TOOL_OPTIONS=-XX:+UseCompactObjectHeaders" >> $GITHUB_ENV
+        shell: bash
       - name: Cache SBT deps
         uses: coursier/cache-action@v6
       - name: Setup Scala with SBT

build.sbt

@@ -168,7 +168,7 @@ lazy val `jsoniter-scala-core` = crossProject(JVMPlatform, JSPlatform, NativePla
   .settings(commonSettings)
   .settings(publishSettings)
   .settings(
-    crossScalaVersions := Seq("3.3.7", "2.13.18", "2.12.20"),
+    crossScalaVersions := Seq("3.3.7", "2.13.18", "2.12.21"),
     scalacOptions ++= (CrossVersion.partialVersion(scalaVersion.value) match {
       case Some((2, _)) => Seq()
       case _ => Seq(
@@ -206,7 +206,7 @@ lazy val `jsoniter-scala-macros` = crossProject(JVMPlatform, JSPlatform, NativeP
   .settings(commonSettings)
   .settings(publishSettings)
   .settings(
-    crossScalaVersions := Seq("3.3.7", "2.13.18", "2.12.20"),
+    crossScalaVersions := Seq("3.3.7", "2.13.18", "2.12.21"),
     scalacOptions ++= (CrossVersion.partialVersion(scalaVersion.value) match {
       case Some((2, _)) => Seq()
       case _ => Seq(
@@ -268,7 +268,7 @@ lazy val `jsoniter-scala-circe` = crossProject(JVMPlatform, JSPlatform, NativePl
   .settings(commonSettings)
   .settings(publishSettings)
   .settings(
-    crossScalaVersions := Seq("3.3.7", "2.13.18", "2.12.20"),
+    crossScalaVersions := Seq("3.3.7", "2.13.18", "2.12.21"),
     scalacOptions ++= (CrossVersion.partialVersion(scalaVersion.value) match {
       case Some((2, _)) => Seq()
       case _ => Seq(