Bump libpq-dev to 13.23-0+deb11u2

[tauhid621]

Summary

• Bump libpq-dev in Docker image from 13.23-0+deb11u1 to 13.23-0+deb11u2
• The previous version was superseded by a Debian bullseye security update (DLA-4524-1) and is no longer available in the apt repos, causing Docker builds to fail

Test plan

• Verify Docker image builds successfully with docker build --target dbt-core docker/

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.40%. Comparing base (97c4bf9) to head (1cc6107).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12806      +/-   ##
==========================================
+ Coverage   91.36%   91.40%   +0.04%     
==========================================
  Files         203      203              
  Lines       25875    25875              
==========================================
+ Hits        23641    23652      +11     
+ Misses       2234     2223      -11     

Flag	Coverage Δ
integration	88.26% <ø> (+0.10%)	⬆️
unit	65.52% <ø> (ø)

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Components	Coverage Δ
Unit Tests	65.52% <ø> (ø)
Integration Tests	88.26% <ø> (+0.10%)	⬆️

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