chore(deps): update postgres docker tag to v15

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
postgres	major	14-alpine -> 15-alpine

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[codecov[bot]]

Codecov Report

Merging #725 (4d62bcc) into main (26796ef) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 4d62bcc differs from pull request most recent head 2c0a1da. Consider uploading reports for the commit 2c0a1da to get more accurate results

@@           Coverage Diff           @@
##             main     #725   +/-   ##
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  Coverage   54.94%   54.94%           
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  Files         211      211           
  Lines       16030    16030           
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  Hits         8808     8808           
  Misses       6845     6845           
  Partials      377      377