Update Helm release valkey to v2.1.2

This MR contains the following updates:

Package	Update	Change
valkey (source)	minor	2.0.2 -> 2.1.2

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Release Notes

bitnami/charts (valkey)

v2.1.2

• [bitnami/valkey] Fix broken failover in sentinel setups (#​30689)

v2.1.1

• [bitnami/valkey] Release 2.1.1 (#​30703) (bfda05c), closes #​30703

v2.1.0

• [bitnami/*] docs: 📝 Add "Prometheus metrics" (batch 6) (#​30675) (7b9cd04), closes #​30675
• [bitnami/valkey] feat: ✨ 📝 Allow password update via values.yaml (#​30690) (20a71ea), closes #​30690

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