fscrypt: update to 0.3.7

fscrypt: update to 0.3.7

Changelog:
- Upgraded various dependencies, including golang.org/x/crypto to resolve the usual
  CVEs in it (but as usual, not actually affecting fscrypt's use of it).
- When selecting password hashing parameters, fscrypt now takes cgroup limitations
  into consideration.
- fscrypt encrypt no longer follows trailing symlinks when writing the recovery
  instructions.
- fscrypt unlock no longer enters an infinite loop when an incorrect key file is
  specified using --key=FILE, --quiet isn't specified, and standard input is a terminal.
- fscrypt unlock no longer enters an infinite loop when an incorrect password is specified,
  --quiet isn't specified, and standard input isn't a terminal.
- The error message when multiple protectors are available now mentions --unlock-with in
  addition to --protector.
- Documented the udev dependency for /dev/disk/by-uuid/ links.

Signed-off-by: John Audia <redacted>