chore: bump retainer version && update CHANGES

CHANGES-5.0.md

@@ -9,6 +9,7 @@
   Prior to this fix, the message publish APIs (`api/v5/publish` and `api/v5/publish/bulk`) echos the message back to the client in HTTP body.
   This change fixed it to only send back the message ID.
 * Add /trace/:name/log_detail HTTP API to return trace file's size and mtime [#9152](https://github.com/emqx/emqx/pull/9152)
+* Allow clear retained/delayed data when client is banned.[#9139](https://github.com/emqx/emqx/pull/9139)
 
 ## Bug fixes
 

apps/emqx_retainer/src/emqx_retainer.app.src

@@ -2,7 +2,7 @@
 {application, emqx_retainer, [
     {description, "EMQX Retainer"},
     % strict semver, bump manually!
-    {vsn, "5.0.5"},
+    {vsn, "5.0.6"},
     {modules, []},
     {registered, [emqx_retainer_sup]},
     {applications, [kernel, stdlib, emqx]},