Update postgresql Docker tag to v16.3.1

[small-hack-renovate]

This PR contains the following updates:

Package	Update	Change
postgresql (source)	minor	16.2.2 -> 16.3.1

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Release Notes

bitnami/charts (postgresql)

v16.3.1

• [bitnami/postgresql] Add Storage Class Configuration to Templates (#​30858)

v16.3.0

• [bitnami/*] Add Bitnami Premium to NOTES.txt (#​30854) (3dfc003), closes #​30854
• [bitnami/postgresql] Detect non-standard images (#​30936) (ac96151), closes #​30936

v16.2.5

• [bitnami/postgresql] Release 16.2.5 (#​30733) (34606c1), closes #​30733

v16.2.4

• [bitnami/*] docs: 📝 Add "Backup & Restore" section (#​30711) (35ab536), closes #​30711
• [bitnami/*] docs: 📝 Add "Prometheus metrics" (batch 5) (#​30674) (ed2a546), closes #​30674
• [bitnami/postgresql] use adminPassword for metrics user when custom user is not set (#​30720) (8f4bc7b), closes #​30720

v16.2.3

• [bitnami/postgresql] Release 16.2.3 (#​30645) (22a4c51), closes #​30645

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