use [testcontainers-java] for Postgres unit test

[sullis]

No description provided.

[codecov]

Codecov Report

Merging #1430 (2633eaa) into dev (8217f20) will increase coverage by 0.14%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                dev    #1430      +/-   ##
============================================
+ Coverage     70.11%   70.25%   +0.14%     
- Complexity      561      563       +2     
============================================
  Files            26       26              
  Lines          2118     2118              
  Branches        296      296              
============================================
+ Hits           1485     1488       +3     
+ Misses          487      484       -3     
  Partials        146      146              

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/com/zaxxer/hikari/util/ConcurrentBag.java	72.34% <0.00%> (-1.07%)	38.00% <0.00%> (-1.00%)
...c/main/java/com/zaxxer/hikari/pool/HikariPool.java	81.36% <0.00%> (+0.35%)	59.00% <0.00%> (ø%)
src/main/java/com/zaxxer/hikari/HikariConfig.java	77.68% <0.00%> (+0.57%)	124.00% <0.00%> (+2.00%)
...n/java/com/zaxxer/hikari/pool/ProxyConnection.java	79.39% <0.00%> (+0.60%)	52.00% <0.00%> (+1.00%)

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[sullis]

@brettwooldridge WDYT?