On NixOS, `bash` isn't under `/bin/bash` but rather in some directory in `$PATH`. Locally, I've been patching those scripts to make them work.

`/usr/bin/env` seems to be the only [portable way](https://unix.stackexchange.com/questions/29608/why-is-it-better-to-use-usr-bin-env-name-instead-of-path-to-name-as-my

) to use binaries from the PATH as interpreters.

Signed-off-by: Quentin Gliech <quentingliech@gmail.com>

Co-authored-by: Dan Callahan <danc@element.io>

pip 21.0 stopped supporting Python 3.5.

Co-authored-by: Dan Callahan <danc@element.io>

pip 21.0 stopped supporting Python 3.5.

I'm not really sure how this was going wrong, but this seems like the
right approach anyway.

Workaround for jaraco/zipp#40