use f-strings in module utils (#10901)

* use f-strings in module utils

* Apply suggestions from code review

Co-authored-by: Felix Fontein <felix@fontein.de>

* remove unused imports

---------

Co-authored-by: Felix Fontein <felix@fontein.de>

plugins/module_utils/utm_utils.py

@@ -71,8 +71,9 @@ class UTM:
         """
         self.info_only = info_only
         self.module = module
-        self.request_url = module.params.get('utm_protocol') + "://" + module.params.get('utm_host') + ":" + to_native(
-            module.params.get('utm_port')) + "/api/objects/" + endpoint + "/"
+        self.request_url = (
+            f"{module.params.get('utm_protocol')}://{module.params.get('utm_host')}:{module.params.get('utm_port')}/api/objects/{endpoint}/"
+        )
 
         """
         The change_relevant_keys will be checked for changes to determine whether the object needs to be updated
@@ -82,9 +83,8 @@ class UTM:
         self.module.params['url_password'] = module.params.get('utm_token')
         if all(elem in self.change_relevant_keys for elem in module.params.keys()):
             raise UTMModuleConfigurationError(
-                "The keys " + to_native(
-                    self.change_relevant_keys) + " to check are not in the modules keys:\n" + to_native(
-                    list(module.params.keys())))
+                f"The keys {self.change_relevant_keys} to check are not in the modules keys:\n{list(module.params.keys())}"
+            )
 
     def execute(self):
         try: