Update the IntelliJ plugin to gjf 1.30.0.

PiperOrigin-RevId: 820845143

Author: plumpy

idea_plugin/build.gradle.kts

@@ -19,7 +19,11 @@ import org.jetbrains.intellij.platform.gradle.TestFrameworkType
 // https://github.com/JetBrains/intellij-platform-gradle-plugin/releases
 plugins {
   id("org.jetbrains.intellij.platform") version "2.9.0"
-  kotlin("jvm") version "2.2.0"
+  // See https://plugins.jetbrains.com/docs/intellij/using-kotlin.html#bundled-stdlib-versions
+  // This version of Kotlin will crash if your Gradle daemon is running under Java 25 (even if that
+  // isn't the JDK you're using to compile). So make sure to update JAVA_HOME and then
+  // `./gradlew --stop`
+  kotlin("jvm") version "2.0.21"
 }
 
 repositories {
@@ -29,10 +33,13 @@ repositories {
 }
 
 // https://github.com/google/google-java-format/releases
-val googleJavaFormatVersion = "1.29.0"
-val pluginPatchVersion = "1"
+val googleJavaFormatVersion = "1.30.0"
+val pluginPatchVersion = "0"
 
 java {
+  toolchain {
+    languageVersion = JavaLanguageVersion.of(21)
+  }
   sourceCompatibility = JavaVersion.VERSION_21
   targetCompatibility = JavaVersion.VERSION_21
 }

idea_plugin/src/main/resources/META-INF/plugin.xml

@@ -35,6 +35,8 @@
   ]]></description>
   <change-notes><![CDATA[
     <dl>
+      <dt>1.30.0.0</dt>
+      <dd>Updated to use google-java-format 1.30.0.</dd>
       <dt>1.29.0.1</dt>
       <dd>Remove uses of deprecated IntelliJ plugin APIs.</dd>
       <dt>1.29.0.0</dt>