Update the IntelliJ plugin to gjf 1.28.0.

PiperOrigin-RevId: 781514043

Author: plumpy

idea_plugin/build.gradle.kts

@@ -18,7 +18,7 @@ import org.jetbrains.intellij.platform.gradle.TestFrameworkType
 
 // https://github.com/JetBrains/intellij-platform-gradle-plugin/releases
 plugins {
-  id("org.jetbrains.intellij.platform") version "2.5.0"
+  id("org.jetbrains.intellij.platform") version "2.6.0"
 }
 
 repositories {
@@ -30,7 +30,7 @@ repositories {
 }
 
 // https://github.com/google/google-java-format/releases
-val googleJavaFormatVersion = "1.27.0"
+val googleJavaFormatVersion = "1.28.0"
 
 java {
   sourceCompatibility = JavaVersion.VERSION_17

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

@@ -35,6 +35,8 @@
   ]]></description>
   <change-notes><![CDATA[
     <dl>
+      <dt>1.28.0.0</dt>
+      <dd>Updated to use google-java-format 1.28.0.</dd>
       <dt>1.27.0.0</dt>
       <dd>Updated to use google-java-format 1.27.0.</dd>
       <dt>1.26.0.0</dt>