Update docker.io/library/postgres Docker tag to v13.18

[renovate]

This PR contains the following updates:

Package	Update	Change
docker.io/library/postgres	minor	13.10 -> 13.18

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.93%. Comparing base (f599a4e) to head (f594f12).
Report is 4 commits behind head on master.

❗ Current head f594f12 differs from pull request most recent head 91243ce

Please upload reports for the commit 91243ce to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
- Coverage   86.95%   86.93%   -0.02%     
==========================================
  Files         132      132              
  Lines        6271     6271              
==========================================
- Hits         5453     5452       -1     
- Misses        818      819       +1     

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