Use postgres 15 in development & bump npm packages

[danielemery]

• Production has been using postgres 15 for a while with no issues, development is now updated to match
• Npm packages that looked safe to upgrade have been upgraded

[codecov-commenter]

Codecov Report

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

Project coverage is 32.92%. Comparing base (83bf3bc) to head (736ac7a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #94 +/- ## ======================================= Coverage 32.92% 32.92% ======================================= Files 22 22 Lines 489 489 Branches 75 75 ======================================= Hits 161 161 Misses 318 318 Partials 10 10 ```

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