Script beginning with #!/bin/bash are failing to run on systems where bash has a different path in the FS, e.g. on NixOS.

$ ./tools/generate_openapi_models.sh
zsh: ./tools/generate_openapi_models.sh: bad interpreter: /bin/bash: no such file or directory

$ file /bin/bash
/bin/bash: cannot open `/bin/bash' (No such file or directory)

$ which bash
/run/current-system/sw/bin/bash

Replacing #!/bin/bash with #!/usr/bin/env bash fixes that.

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• Contributions should target the dev branch. Did you create your branch from dev?
• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests?
2. Have you formatted your code locally using cargo +nightly fmt --all command prior to submission?
3. Have you checked your code using cargo clippy --all --all-features command?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?