update bash scripts to #!/usr/bin/env bash

[andiradulescu]

Mostly for macOS.

A good explaination here.

Needed this to run som_debug.sh on macOS, but decided to update all scripts.

Same thing for:

• openpilot https://github.com/commaai/openpilot/pull/33111
• agnos-builder https://github.com/commaai/agnos-builder/pull/268