`tools/install_builder_prequisites.sh` is broken for macOS users

[jordanhendricks]

Per @iliana, the builder prereq script is currently broken on macOS because the versionless postgresql package no longer exists.

[iliana]

Install (or update) [coreutils postgresql pkg-config libxmlsec1]? (y/n): y
Warning: No available formula with the name "homebrew/core/postgresql".
Failed to run command -- will try 2 more times

[benjaminleonard]

Switching this to postgresql@13 or postgresql@14 seems to work for me on macOS