fix(deps): update dependency pg to v8.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
pg (source)	8.20.0 → 8.21.0

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Release Notes

brianc/node-postgres (pg)

v8.21.0

Compare Source

• Handle SASL SCRAM server error responses properly.
• Add support for node@26.
• Add scramMaxIterations config option.
• Add client.getTransactionStatus() method.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.06%. Comparing base (5db302b) to head (1808e0d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1643   +/-   ##
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  Coverage   43.06%   43.06%           
=======================================
  Files         149      149           
  Lines        5636     5636           
  Branches      985      985           
=======================================
  Hits         2427     2427           
  Misses       3209     3209           

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