Set PREV_VERSION to 13 on el10 PG 16 images

[ShimShtein]

Fixes #661 The binaries inside the container for the previous version are from version 13, let's set the default ENV variables to match the packages.

Summary by CodeRabbit

• Chores
  • Updated the PostgreSQL 16 container configuration to use PostgreSQL 13 as the referenced previous major version in supported image builds.
  • Applied the same environment setting update across both Linux image variants, with no other visible runtime or port changes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a02f3697-66ab-4985-b91c-da8adc215fd0

📥 Commits

Reviewing files that changed from the base of the PR and between f1c89bc and 0b4e201.

📒 Files selected for processing (2)

• 16/Dockerfile.c10s
• 16/Dockerfile.rhel10

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📝 Walkthrough

Walkthrough

Both PostgreSQL 16 Dockerfiles (c10s and rhel10 variants) have their POSTGRESQL_PREV_VERSION environment variable value changed from 15 to 13, correcting the previous major version reference used for upgrade tooling.

Changes

PREV_VERSION correction

Layer / File(s)	Summary
Update POSTGRESQL_PREV_VERSION value 16/Dockerfile.c10s, 16/Dockerfile.rhel10	POSTGRESQL_PREV_VERSION ENV setting changed from 15 to 13 in both Dockerfiles while POSTGRESQL_VERSION=16 remains unchanged.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Related issues: #661 (PostgreSQL 16 images based on EL10 have an incorrect POSTGRESQL_PREV_VERSION set)

Suggested labels: bug, el10

Suggested reviewers: phracek, praiskup

_{🐰 A hop, a fix, a tiny tweak,
from fifteen down to thirteen's peek,
the upgrade path now works just right,
my carrot patch sleeps sound tonight.}

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: updating PREV_VERSION to 13 for EL10 PostgreSQL 16 images.
Linked Issues check	✅ Passed	The Dockerfile changes set POSTGRESQL_PREV_VERSION to 13 in both EL10 PostgreSQL 16 images, matching issue #661.
Out of Scope Changes check	✅ Passed	The PR only updates the previous PostgreSQL version value in the two targeted Dockerfiles and adds no unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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