[5.0.0] Bump version to 5.0.0, remove deprecated features (#4516)

* Remove deprecated features.

* Fix changelog.

* Remove ignore.txt entries.

* One more.

* Remove state=get tests.

plugins/modules/packaging/os/opkg.py

@@ -50,8 +50,6 @@ options:
     update_cache:
         description:
             - Update the package DB first.
-            - Alias C(update-cache) has been deprecated and will be removed in community.general 5.0.0.
-        aliases: ['update-cache']
         default: false
         type: bool
 requirements:
@@ -177,9 +175,7 @@ def main():
             state=dict(default="present", choices=["present", "installed", "absent", "removed"]),
             force=dict(default="", choices=["", "depends", "maintainer", "reinstall", "overwrite", "downgrade", "space", "postinstall", "remove",
                                             "checksum", "removal-of-dependent-packages"]),
-            update_cache=dict(
-                default="no", aliases=["update-cache"], type='bool',
-                deprecated_aliases=[dict(name='update-cache', version='5.0.0', collection_name='community.general')]),
+            update_cache=dict(default=False, type='bool'),
         )
     )