chore(deps): update mariadb docker tag to v20.5.6

This MR contains the following updates:

Package	Type	Update	Change
mariadb (source)	HelmChart	minor	20.4.3 -> 20.5.6

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Release Notes

bitnami/charts (mariadb)

v20.5.6

• [bitnami/mariadb] Update dependency references (#​33856)

v20.5.5

• [bitnami/mariadb] Update dependency references (#​33554) (018ee9e), closes #​33554

v20.5.4

• [bitnami/mariadb] chore: Update common and remove k8s < 1.23 references (#​33393 (a6d3726), closes #​33393

v20.5.3

• [bitnami/mariadb] adds spec.terminationGracePeriodSeconds to mariadb (#​33168) (22790f0), closes #​33168

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