Update postgres Docker tag to v14

[renovate]

This PR contains the following updates:

Package	Update	Change
postgres	major	12-alpine -> 14-alpine

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[codecov]

Codecov Report

Merging #225 (68c3358) into master (c8ae8aa) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #225   +/-   ##
=======================================
  Coverage   91.66%   91.66%           
=======================================
  Files           7        7           
  Lines         144      144           
  Branches       39       39           
=======================================
  Hits          132      132           
  Misses         12       12           

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