chore(deps): update mariadb docker tag to v21.0.7

This MR contains the following updates:

Package	Type	Update	Change
mariadb (source)	HelmChart	patch	21.0.3 -> 21.0.7

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Release Notes

bitnami/charts (mariadb)

v21.0.7

• [bitnami/mariadb] ⚡ ⬆ Update dependency references (#​35702)

v21.0.6

• [bitnami/mariadb] ⚡ ⬆ Update dependency references (#​35618) (4f3de22), closes #​35618

v21.0.4

• [bitnami/*] Adapt main README and change ascii (#​35173) (73d15e0), closes #​35173
• [bitnami/*] Adapt welcome message to BSI (#​35170) (e1c8146), closes #​35170
• [bitnami/*] Add BSI to charts' READMEs (#​35174) (4973fd0), closes #​35174
• [bitnami/*] docs: update BSI warning on charts' notes (#​35340) (07483a5), closes #​35340
• [bitnami/mariadb] ⚡ ⬆ Update dependency references (#​35506) (6f4f2cb), closes #​35506

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