They were Rails' default and are unnecessarily overridden.

Signed-off-by: David Wagner <david@marvid.fr>

attr_encrypted (1.3.4 => 3.0.1) Changelog:
https://github.com/attr-encrypted/attr_encrypted/blob/master/CHANGELOG.m
d

attr_encrypted 2.x included a vulnerability, so that major version is
skipped. 3.x requires that the algorithm and mode used by each
encrypted attribute is specified explicitly.

`nil` is no longer a valid value for the encrypted_value_iv field, so
it’s changed to a randomly generated string.

In 8278b763d96ef10c6494409b18b7eb541463af29 the default behaviour of annotation
has changes, which was causing a lot of noise in diffs. We decided in #17382
that it is better to get rid of the whole annotate gem, and instead let people
look at schema.rb for the columns in a table.

Fixes: #17382

* 8-4-stable: (285 commits)
  Add Changelog entry for build traces data integrity fix
  Update doc_styleguide.md [ci skip]
  Added hint that you can search users by name, username, or email.
  Add changelog
  Version 8.4.0.rc1
  Randomize metrics sample intervals
  Make the metrics sampler interval configurable
  Don't automatically require awesome_print
  Disable colorization if STDOUT is not a tty
  Block the reported user before destroying the record
  changes `$quote-gray` to `$secondary-text`
  makes message plural for multiple MRs and removes from loop. Duh.
  Prepare Installation and Update docs for 8.4 RC1
  Mention channel/key bug in irkerd docs
  Revert "Remove the `:coffee` and `:coffeescript` Haml filters"
  gets merge request discussion working again
  adds back in discussion.haml.html for issues commenting and closing/reopening properly.
  removing last chunk of MR ajax changes, rest will be in another MR
  reverting more MR ajax files, will appear in different commit
  reverting MR ajax changes, which will be in a different MR
  ...