release 1.15.6 (#2863)

.github_changelog_generator

@@ -1,5 +1,5 @@
 unreleased=true
-future-release=1.15.5
+future-release=1.15.6
 exclude-labels=duplicate,support,question,invalid,wontfix,release,waiting for feedback,documentation
 enhancement_labels=>enhancement,Enhancement,feature request,translation i18n,technical debt,documentation
 issues-wo-labels=false

src/Constants.php

@@ -17,11 +17,11 @@ class Constants
     /**
      * The current release version
      */
-    public const VERSION = '1.15.5';
+    public const VERSION = '1.15.6';
     /**
      * The current release: major * 10000 + minor * 100 + patch
      */
-    public const VERSION_ID = 11505;
+    public const VERSION_ID = 11506;
     /**
      * The current release status, either "stable" or "dev"
      */