WHY
See AWS email:
"[Action Required] Amazon RDS PostgreSQL is deprecating minor versions on March 31, 2025"

HOW
We should move to the highest major and minor versions possible to maximise the time before next bump is required.
Need to ensure compatibility with 3scale and RHSSO

Take the opportunity to bump ElasticCache

TESTS
<List of related tests>

DONE
<bullet point items for what should be completed>