services: Remove (rosenthal utils serializers yaml) references.

This is a follow-up to commit 8782619822.

* modules/rosenthal/services/child-error.scm (home-wakapi-shepherd-service)
* modules/rosenthal/services/mail.scm (home-goimapnotify-shepherd): Use
yaml-file.

modules/rosenthal/services/child-error.scm

@@ -5,8 +5,8 @@
   ;; Utilities
   #:use-module (guix gexp)
   #:use-module (guix records)
+  #:use-module (rosenthal utils file)
   #:use-module (rosenthal utils predicates)
-  #:use-module (rosenthal utils serializers yaml)
   ;; Guix System
   #:use-module (gnu system shadow)
   ;; Guix System - services
@@ -274,16 +274,14 @@ headers.  This can expose sensitive information in your logs.")
    (file-like wakapi-bin)
    "The wakapi package.")
   (config
-   (yaml-config '())
+   gexp
    "Association list of Wakapi configurations.")
   (no-serialization))
 
 (define home-wakapi-shepherd-service
   (match-record-lambda <home-wakapi-configuration>
       (wakapi config)
-    (let ((config-file (mixed-text-file
-                        "wakapi.yaml"
-                        #~(string-append #$@(yaml-serialize config) "\n"))))
+    (let ((config-file (yaml-file "wakapi.yaml" config)))
       (list (shepherd-service
              (documentation "Run wakapi.")
              (provision '(wakapi))

modules/rosenthal/services/mail.scm

@@ -7,7 +7,7 @@
   ;; Utilities
   #:use-module (guix gexp)
   #:use-module (guix records)
-  #:use-module (rosenthal utils serializers yaml)
+  #:use-module (rosenthal utils file)
   ;; Guix System - services
   #:use-module (gnu services)
   #:use-module (gnu services admin)
@@ -91,7 +91,7 @@
    (file-like goimapnotify)
    "")
   (config
-   yaml-config
+   gexp
    "")
   (wait
    (integer 1)
@@ -109,8 +109,7 @@
 (define home-goimapnotify-shepherd
   (match-record-lambda <home-goimapnotify-configuration>
       (goimapnotify config wait shepherd-provision shepherd-requirement auto-start?)
-    (let ((config-file
-           (mixed-text-file "goimapnotify.yaml" (yaml-serialize config))))
+    (let ((config-file (yaml-file "goimapnotify.yaml" config)))
       (list (shepherd-service
               (provision shepherd-provision)
               (requirement shepherd-requirement)

modules/rosenthal/services/monitoring.scm

@@ -8,7 +8,6 @@
   #:use-module (guix records)
   #:use-module (rosenthal utils file)
   #:use-module (rosenthal utils predicates)
-  #:use-module (rosenthal utils serializers yaml)
   ;; Guix System
   #:use-module (gnu system shadow)
   ;; Guix System - services

modules/rosenthal/services/web.scm

@@ -8,7 +8,6 @@
   #:use-module (guix records)
   #:use-module (rosenthal utils file)
   #:use-module (rosenthal utils predicates)
-  #:use-module (rosenthal utils serializers yaml)
   ;; Guix System
   #:use-module (gnu system privilege)
   #:use-module (gnu system shadow)