chore(deps): update mariadb docker tag to v20.4.2

This MR contains the following updates:

Package	Type	Update	Change
mariadb (source)	HelmChart	patch	20.4.1 -> 20.4.2

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Release Notes

bitnami/charts (mariadb)

v20.4.2

• [bitnami/mariadb] Release 20.4.2 (#​32557)

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