Update postgres Docker tag to v13.18

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
postgres	service	minor	13.17 -> 13.18

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.93%. Comparing base (6db5b4b) to head (d577df0). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1365 +/- ## ======================================= Coverage 95.93% 95.93% ======================================= Files 285 285 Lines 5063 5063 ======================================= Hits 4857 4857 Misses 206 206 ```

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