chore: bump version to 1.6.0

Author: github-actions[bot]

gradle.properties

@@ -7,7 +7,7 @@ org.gradle.caching=true
 
 pluginName=html-attribute-folder
 pluginGroup=dev.zbinski
-pluginVersion=1.5.0
+pluginVersion=1.6.0
 platformVersion=2025.3
 # @see https://plugins.jetbrains.com/docs/intellij/tools-intellij-platform-gradle-plugin-types.html#IntelliJPlatformType
 platformType=IU