chore(rds): added Postgres 16.7 version

[ashishdhingra]

Issue # (if applicable)

Closes #33508.

Reason for this change

Per Amazon RDS for PostgreSQL updates, PostgreSQL version 16.7 is now available on Amazon RDS.

Executing AWS CLI command aws rds describe-db-engine-versions --engine postgres --output table --query 'DBEngineVersions[*].{Engine:Engine,EngineVersion:EngineVersion}' also lists 16.7 as one of the supported versions.

Description of changes

Added 16.7 version to PostgresEngineVersion class.

Describe any new or updated permissions being added

Description of how you validated changes

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.16%. Comparing base (fb587b8) to head (09a9e64).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33509   +/-   ##
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  Coverage   82.16%   82.16%           
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  Files         119      119           
  Lines        6857     6857           
  Branches     1157     1157           
=======================================
  Hits         5634     5634           
  Misses       1120     1120           
  Partials      103      103           

Flag	Coverage Δ
suite.unit	82.16% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.16% <ø> (ø)

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 09a9e64
• Result: SUCCEEDED
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