use Bitwise is deprecated in elixir 1.14-dev

[shahryarjb]

Steps to Reproduce

Hi friends, I test my code in elixir 1.14-dev before releasing official condition

Expected Result

..

Actual Result

warning: use Bitwise is deprecated. import Bitwise instead
  lib/guardian/permissions/atom_encoding.ex:7: Guardian.Permissions.AtomEncoding

warning: use Bitwise is deprecated. import Bitwise instead
  lib/guardian/permissions/bitwise_encoding.ex:7: Guardian.Permissions.BitwiseEncoding

warning: use Bitwise is deprecated. import Bitwise instead
  lib/guardian/permissions/text_encoding.ex:7: Guardian.Permissions.TextEncoding