rhsm_release: removing required=true for 'release' option (#6401)

Fix rhsm_release by removing required=true for 'release' option.

changelogs/fragments/6401-rhsm_release-required.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "rhsm_release - make ``release`` parameter not required so it is possible to pass ``null`` as a value. This only was possible in the past due to a bug in ansible-core that now has been fixed (https://github.com/ansible-collections/community.general/pull/6401)."

plugins/modules/rhsm_release.py

@@ -32,8 +32,8 @@ attributes:
 options:
   release:
     description:
-      - RHSM release version to use (use null to unset)
-    required: true
+      - RHSM release version to use.
+      - To unset either pass C(null) for this option, or omit this option.
     type: str
 author:
   - Sean Myers (@seandst)
@@ -107,7 +107,7 @@ def set_release(module, release):
 def main():
     module = AnsibleModule(
         argument_spec=dict(
-            release=dict(type='str', required=True),
+            release=dict(type='str'),
         ),
         supports_check_mode=True
     )