Use /usr/bin/env instead of /bin/env

[loganrosen]

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Description

In #2599, the shebang for the scripts in the bin directory changed to /bin/env, even though the commit message says they were changed to use /usr/bin/env. /usr/bin/env bash is the correct portable shebang to use, as env is in /usr/bin (not /bin) on most Unix-like systems.

Type of change

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• Bug fix
• New feature
• Major change (fix or feature that would cause existing functionality to work differently than in the current version)