gnu: zabbix-agentd: Update to 4.4.1.

* gnu/packages/monitoring.scm (zabbix-agentd): Update to 4.4.1.
* gnu/services/monitoring.scm (%zabbix-front-end-configuration-nginx): Add
listen record field.

gnu/packages/monitoring.scm

@@ -152,7 +152,7 @@ etc. via a Web interface.  Features include:
 (define-public zabbix-agentd
   (package
     (name "zabbix-agentd")
-    (version "4.2.7")
+    (version "4.4.1")
     (source
      (origin
        (method url-fetch)
@@ -161,7 +161,7 @@ etc. via a Web interface.  Features include:
              "/zabbix-" version ".tar.gz"))
        (sha256
         (base32
-         "09znh8x1sass5mw6wjrfmizjbfls8ad2c16y24ldfj40hlfxz6wx"))))
+         "0jjn2przn9s25slrcxmq8iqdgqkgxnqs45zy0n1ma6nlgmclxxqb"))))
     (build-system gnu-build-system)
     (arguments
      `(#:configure-flags

gnu/services/monitoring.scm

@@ -473,7 +473,8 @@ configuration file."))
                            (list "
 fastcgi_param PHP_VALUE \"post_max_size = 16M
                           max_execution_time = 300\";
-")))))))))
+")))))))
+   (listen '("80"))))
 
 (define-configuration zabbix-front-end-configuration
   ;; TODO: Specify zabbix front-end package.