This PR adds bun to list of package managers that can be used on the CI
deployment page.
Fixes#31431
## Current Behavior
The CI deployment documentation at
https://nx.dev/ci/recipes/other/ci-deployment only mentions npm, yarn,
and pnpm as supported package managers. However, Bun is actually
supported by Nx as shown in the PackageManager type
definition which includes 'bun' as a valid option.
## Expected Behavior
The documentation should accurately reflect all supported package
managers, including Bun. Users should be aware that they can use Bun as
their package manager when following the CI deployment recipes.
## Related Issue(s)
Fixes#31431
b89ca32a01