ansible_galaxy_install: minor improvements based on MH updates (#4752)

* ansible_galaxy_install: minor improvements based on MH updates

* added changelog fragment

(cherry picked from commit d019e22)

changelogs/fragments/4752-ansible-galaxy-install-mh-updates.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - ansible_galaxy_install - minor refactoring using latest ``ModuleHelper`` updates (https://github.com/ansible-collections/community.general/pull/4752).

plugins/modules/packaging/language/ansible_galaxy_install.py

@@ -226,7 +226,7 @@ class AnsibleGalaxyInstall(CmdModuleHelper):
     check_rc = True
 
     def _get_ansible_galaxy_version(self):
-        ansible_galaxy = self.module.get_bin_path("ansible-galaxy", required=True)
+        ansible_galaxy = self.get_bin_path("ansible-galaxy", required=True)
         dummy, out, dummy = self.module.run_command([ansible_galaxy, "--version"], check_rc=True)
         line = out.splitlines()[0]
         match = self._RE_GALAXY_VERSION.match(line)
@@ -302,9 +302,9 @@ def _setup29(self):
         self.vars.set("new_roles", {})
         self.vars.set("ansible29_change", False, change=True, output=False)
         if not (self.vars.ack_ansible29 or self.vars.ack_min_ansiblecore211):
-            self.module.warn("Ansible 2.9 or older: unable to retrieve lists of roles and collections already installed")
+            self.warn("Ansible 2.9 or older: unable to retrieve lists of roles and collections already installed")
             if self.vars.requirements_file is not None and self.vars.type == 'both':
-                self.module.warn("Ansible 2.9 or older: will install only roles from requirement files")
+                self.warn("Ansible 2.9 or older: will install only roles from requirement files")
 
     def _setup210plus(self):
         self.vars.set("new_collections", {}, change=True)