[Improvement-17560][Helm] Migrate Helm chart dependencies to current Bitnami repository

- Update PostgreSQL chart from 10.3.18 to 12.1.5 (recommended by Copilot AI review)
- Update Zookeeper chart from 11.4.11 to 13.8.7 (latest stable in 13.8.x series)
- Update MySQL chart from 9.4.1 to 9.23.0 (backward compatible)
- Update MinIO chart from 11.10.13 to 12.13.2 (backward compatible)
- Migrate all dependencies from archive-full-index to current Bitnami repository
- Remove outdated comments about Bitnami repository changes

This conservative update approach:
- Uses PostgreSQL 12.1.5 as suggested to avoid breaking configuration schema changes
- Maintains backward compatibility with existing values.yaml and templates
- Migrates from legacy Bitnami registry to current repository
- All dependencies verified to download successfully from new repository

Addresses Copilot AI review feedback about breaking changes in newer chart versions.

Closes #17561
Closes #17562
Closes #17563

Part of #17560

Author: zhan7236

deploy/kubernetes/dolphinscheduler/Chart.yaml

@@ -43,24 +43,18 @@ appVersion: 3.1.0
 
 dependencies:
 - name: postgresql
-  version: 10.3.18
-  # Due to a change in the Bitnami repo, https://charts.bitnami.com/bitnami was truncated only
-  # containing entries for the latest 6 months (from January 2022 on).
-  # This URL: https://raw.githubusercontent.com/bitnami/charts/archive-full-index/bitnami
-  # contains the full 'index.yaml'.
-  # See detail here: https://github.com/bitnami/charts/issues/10833
-  repository: https://raw.githubusercontent.com/bitnami/charts/archive-full-index/bitnami
+  version: 12.1.5
+  repository: https://charts.bitnami.com/bitnami
   condition: postgresql.enabled
 - name: zookeeper
-  version: 11.4.11
-  # Same as above.
-  repository: https://raw.githubusercontent.com/bitnami/charts/archive-full-index/bitnami
+  version: 13.8.7
+  repository: https://charts.bitnami.com/bitnami
   condition: zookeeper.enabled
 - name: mysql
-  version: 9.4.1
-  repository: https://raw.githubusercontent.com/bitnami/charts/archive-full-index/bitnami
+  version: 9.23.0
+  repository: https://charts.bitnami.com/bitnami
   condition: mysql.enabled
 - name: minio
-  version: 11.10.13
-  repository: https://raw.githubusercontent.com/bitnami/charts/archive-full-index/bitnami
+  version: 12.13.2
+  repository: https://charts.bitnami.com/bitnami
   condition: minio.enabled