Update test databases

[albertyw]

Update versions of postgres and mariadb to be tested against

Depends on #834

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.20%. Comparing base (1b68320) to head (2721278).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #835      +/-   ##
==========================================
- Coverage   87.33%   87.20%   -0.14%     
==========================================
  Files          53       53              
  Lines        2172     2172              
==========================================
- Hits         1897     1894       -3     
- Misses        275      278       +3     

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