Update CHANGELOG

CHANGELOG

+2023-05-20: moved agent plugin from ~/local/share/check_mk/agents/plugins/linux
+                                 to ~/local/share/check_mk/agents/plugins
+            renamed bakery plugin from squid to squid.py
+            moved to ~/local/lib/check_mk/gui/plugins/wato
+            renamed from check_squid.py to squid.py
+            changed client_reqps to client_requests
+            changed server_reqps to server_requests
+            changed cpu_time to cpu_usage
 2023-05-21: rewrite for CMK 2.1.x
 2023-05-22: agent plugin: fixed missing "<" in section name
+2023-09-21: bakery plugin: moved file to ~/local/lib/check_mk/base/cee/plugins/bakery (THX to Andreas Doehler)
+                           fix crash if port not configured in wato