Update aemerson's pubkeys

Update aemerson's pubkeys

Fixes: https://tracker.ceph.com/issues/46040
```
<dgalloway> Aemerson, looks like the second key here is the same one as you provided.  which is fine.  I'll just change the identifer at the end.  But are there any keys in there you no longer have that can be cleaned up?  https://github.com/ceph/keys/blob/master/ssh/aemerson.pub
<Aemerson> Probaby the first one, since it's ed25519.
<Aemerson> And it and the second are from the same machine.
```

Signed-off-by: David Galloway <dgallowa@redhat.com>