DPE-8296 Bump PostgreSQL to 14.19

[taurus-forever]

Issue

The charm ships non-latest PostgreSQL 14.18.

Solution

Bump PostgreSQL to 14.19.

Checklist

• I have added or updated any relevant documentation.
• I have cleaned any remaining cloud resources from my accounts.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.76%. Comparing base (0b2aa92) to head (85b3c58).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1147   +/-   ##
=======================================
  Coverage   75.76%   75.76%           
=======================================
  Files          16       16           
  Lines        4163     4163           
  Branches      631      631           
=======================================
  Hits         3154     3154           
  Misses        786      786           
  Partials      223      223           

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