AO3-6647 Fix paperclip with no paperclip patch

[zz9pzza]

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Issue

https://otwarchive.atlassian.net/browse/AO3-6647

Purpose

Fix a 500 error that occurs when trying to get the URL of an icon uploaded to s3:

3.1.4 :018 > begin
3.1.4 :019 >   u = User.where(login:"zz9pzza").first
3.1.4 :020 >   puts u.pseuds.first.icon.url
3.1.4 :021 > rescue => exception
3.1.4 :022 >   puts exception.backtrace
3.1.4 :023 >   raise # always reraise
3.1.4 :024 > end
/home/ao3app/.rvm/rubies/ruby-3.1.4/lib/ruby/3.1.0/psych.rb:322:in `safe_load'
/home/ao3app/app/shared/bundle/ruby/3.1.0/gems/kt-paperclip-7.1.0/lib/paperclip/storage/s3.rb:432:in `find_credentials'
/home/ao3app/app/shared/bundle/ruby/3.1.0/gems/kt-paperclip-7.1.0/lib/paperclip/storage/s3.rb:316:in `parse_credentials'
/home/ao3app/app/shared/bundle/ruby/3.1.0/gems/kt-paperclip-7.1.0/lib/paperclip/storage/s3.rb:198:in `s3_credentials'

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[brianjaustin]

LGTM, noting that this will require Ansible changes as discussed elsewhere