update requirements to limit sqlachemy version to 1.1

[vincentsarago]

https://github.com/CloverHealth/pytest-pgsql/blob/75c7be051545ea20420557d90886cbd32eb46151/requirements.txt#L3

ref https://github.com/developmentseed/tipg/pull/15#issuecomment-1422876161

I know this library is not maintained anymore so this is mostly a FYI