bug(common): macos.sh developer install can't continue after homebrew upgrade

**Describe the bug**
brew-upgrading bash and other dependencies can result in bash being unstable, meaning the install does not proceed

**To Reproduce**
1. `resources/devbox/macos/macos.sh all kmcomp pandoc sentry-cli`

**Expected behavior**
- expected to be up and running with keyman development! 🚀

**Screenshots**
All shell windows on the system (including the one with the installer) terminate their shells and other processes with "Killed: 9"
```
$ ls
Killed: 9
```

---

**Keyman for Windows/macOS/Linux:**
- OS: macOS Monterey 12.1 (21C52)
- Keyman version: n/a
-
**Additional context**
- Probably the right solution is to recommend a brew upgrade _outside_ of the setup script, and reloading terminal windows before proceeding.