chore: rename plugin group

Author: xepozz

gradle.properties

@@ -1,6 +1,6 @@
 # IntelliJ Platform Artifacts Repositories -> https://plugins.jetbrains.com/docs/intellij/intellij-artifacts.html
 
-pluginGroup = com.github.xepozz.php_opcodes
+pluginGroup = com.github.xepozz.php_dump
 pluginName = PHP Dump
 pluginRepositoryUrl = https://github.com/xepozz/php-opcodes-plugin
 # SemVer format -> https://semver.org