Use released version of mrlesmithjr.mdadm

An initial version of the mrlesmithjr.mdadm role was released 2 days
ago. There are only minimal changes compared to the commit we were
using. This should avoid the following issue seen in CI:

[WARNING]: - mrlesmithjr.mdadm was NOT installed successfully: - the specified
version (5be3ee7d330aa17317897bd104dc87ff0df11915) of mrlesmithjr.mdadm was not
found in the list of available versions ([{'id': 152374, 'url': '', 'related':
{}, 'summary_fields': {}, 'created': '2021-04-24T02:51:30.453954Z', 'modified':
'2021-04-24T02:51:30.453980Z', 'name': 'v0.1.0', 'version': '0.1.0',
'commit_date': '2021-04-23T22:50:00-04:00', 'commit_sha':
'b8a9853b7eafa9afc62bbb7728f64fd5dc9f54de', 'download_url':
'https://github.com/mrlesmithjr/ansible-mdadm/archive/v0.1.0.tar.gz', 'active':
None}]).
ERROR! - you can use --ignore-errors to skip failed roles and finish processing the list.

Change-Id: I3d85b341cf541cfb9b486021e66b316833fe9130