Update rubocop and rubocop-rspec (#26329)

Spec media attachment speedups (#25416)

Fix AVIF attachments (#26264)

Fix `RSpec/EmptyExampleGroup` cop (#24735)

Add stricter protocol fields validation for accounts (#25937)

Fix `RSpec/SubjectDeclaration` cop (#25312)

Merge pull request from GHSA-9928-3cp5-93fm

* Fix attachments getting processed despite failing content-type validation

* Add a restrictive ImageMagick security policy tailored for Mastodon

* Fix misdetection of MP3 files with large cover art

* Reject unprocessable audio/video files instead of keeping them unchanged

Fix `RSpec/VerifiedDoubles` cop (#25469)

Fix user settings not getting validated (#25508)

Update rubocop-rspec to version 2.22.0, fix `RSpec/IndexedLet` cop (#24698)

Fix `ArgumentError` in `/api/v1/admin/accounts/:id/action` (#25386)

Reduce factory data created in spec/models/trends/statuses spec (#25410)

Reduce `RSpec/MultipleExpectations` cop max to 8 (#25313)

Disable paperclip processing in specs (#25359)

Fix RSpec/MissingExampleGroupArgument cop (#25310)

Fix `RSpec/DescribedClass` cop (#25104)

Add coverage for `DomainBlock#public_domain` method (#25283)

Add support for importing lists (#25203)

Fix RSpec/ExpectChange cop (#25101)

Fix RSpec/PredicateMatcher cop (#25102)