…ackages

Due to npm/cli#6470, I added `read-package-json` and
`read-package-json-fast` to this repo as dev deps to run the new tests
from #31 against those packages. I found a few discrepancies which I
fixed in this PR.

Full list of changes are as follows:

**`normalize` / `read-package-json-fast`**
- convert `bundleDependencies: false` to `[]`

**`prepare` / `read-package-json`**
- ignore `directories.bin` if `bin` is present
- walk up filesystem to look for git directory
- log a warning for inaccessible bin entries but dont delete

These changes will be tracked in npm/statusboard#487 to see if they
should be made as breaking changes with npm 10.

These legacy tests can be removed once we have decided to make these
breaking changes.

Ref: npm/cli#6470
Fixes: #35