[mariadb] Bumped tag to mariadb-110.4.19mariabionic-ls20

[nicholaswilde]

Signed-off-by: Nicholas Wilde ncwilde43@gmail.com

Description of the change

Benefits

Possible drawbacks

Applicable issues

• fixes #

Additional information

Checklist

• [X] Chart version bumped in Chart.yaml according to semver.
• [X] Title of the PR starts with chart name (e.g. [home-assistant])
• [X] README.md was updated with helm-docs