chore(deps): update mariadb docker tag to v20.2.1

[dslab-renovate]

This PR contains the following updates:

Package	Update	Change
mariadb (source)	minor	20.1.1 -> 20.2.1

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Release Notes

bitnami/charts (mariadb)

v20.2.1

• [bitnami/mariadb] Release 20.2.1 (#​31043)

v20.2.0

• [bitnami/*] Add Bitnami Premium to NOTES.txt (#​30854) (3dfc003), closes #​30854
• [bitnami/*] docs: 📝 Add "Backup & Restore" section (#​30711) (35ab536), closes #​30711
• [bitnami/*] docs: 📝 Add "Prometheus metrics" (batch 4) (#​30669) (a4ec006), closes #​30669
• [bitnami/*] docs: 📝 Add "Prometheus metrics" (batch 6) (#​30675) (7b9cd04), closes #​30675
• [bitnami/*] docs: 📝 Unify "Securing Traffic using TLS" section (#​30707) (b572333), closes #​30707
• [bitnami/mariadb] Detect non-standard images (#​30956) (bb3402c), closes #​30956
• [bitnami/mariadb] Fix typo in README (#​30800) (2b8b5f5), closes #​30800

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