Add Hilmar to Git Crypt

[gaurav]

This PR adds @hlapp to Git Crypt.

New collaborators:

09266575A8EC4AA3BD2C7740073F565E8824280E
    Hilmar Lapp <hilmar.lapp@duke.edu>

[hlapp]

Yep works. I had actually already tested with the previously encrypted phyloreferences. That is, if I successfully git crypt unlock on this branch (which has my key added but at first didn't encrypted files present anymore) and then checkout a commit where the encrypted files are still present (but which doesn't have my key added), then the files will be decrypted.

[hlapp]

Also of note, if you pull an encrypted file from remote into an unlocked repo checkout, it will be decrypted there.

More generally, unlocking or locking a repo is repo-wide and history-wide, forward and backward, not specific to a commit or file(s). (And arguably that's the most useful behavior too.)