Update mariadb Docker tag to v20.2.4

This MR contains the following updates:

Package	Type	Update	Change
mariadb (source)	HelmChart	patch	20.2.2 -> 20.2.4

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Release Notes

bitnami/charts (mariadb)

v20.2.4

• [bitnami/*] Use CDN url for the Bitnami Application Icons (#​31881) (d9bb11a), closes #​31881
• [bitnami/mariadb] chore(resources): Increase primary resources (#​31959) (04f85f5), closes #​31959

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