miscellaneous 72 stable prod fixes (Postgres)

[JesseChavez]

Hi JRuby team

Here is some miscellaneous fixes the we found and fixed in my fork

Notes I only cherry-picked Postgres fixes and I have not tested in SQLite and MySQL

hope casting the binds is not affecting MySQL or SQLite

[enebo]

@JesseChavez Do you have any idea on the massive regression on postgresql tests? I do not think it has anything to do with your PR but we seem to no longer be closing active connections (at least in some case). I mean maybe we are raising on some type binds but not cleaning stuff up but obviously not running a job since september on 72-stable is the most likely culprit.