MGDAPI-5092 bump rds version

[laurafitzgerald]

Overview

Jira: https://issues.redhat.com/browse/MGDAPI-5092

Verification

• e2e tests shuld be sufficient for this.

[codecov]

Codecov Report

Merging #621 (3bf3bc9) into master (5c827e1) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #621   +/-   ##
=======================================
  Coverage   68.75%   68.75%           
=======================================
  Files          38       38           
  Lines        5115     5115           
=======================================
  Hits         3517     3517           
  Misses       1238     1238           
  Partials      360      360           

Impacted Files	Coverage Δ
pkg/providers/aws/provider_postgres.go	63.51% <ø> (ø)

[laurafitzgerald]

Deployed to a ROSA cluster and RDS created with the updated engine version

[briangallagher]

/lgtm
/approve

[openshift-ci]

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