Clear ActiveRecord object memoized by take

Since 9c913116, if you run `rackup`
in a machine that doesn't have that folder, the server will not start.

This doesn't happen on `rails s` because we create that folder when
starting the server on
https://github.com/rails/rails/blob/8c8b02784a637570451d7810fd3dfed4eae9a77d/railties/lib/rails/commands/server/server_command.rb#L70-L74.

[Rafael Mendonça França + bogdanvlviv]

Prevent TagBuilder modify options

Fix Rails Version in Guides Index

Only Rails 6.0 and 5.2 are supported now.

Make prepared statement status thread and instance-specific

Fix new default value for return_only_media_type_on_content_type

Talk about the thread-safe concerns of the classic autoloader in
development.

read webpacker config to populate autoload paths

This was always the intended API as per discussion in https://github.com/rails/rails/issues/36916, however versions before Rails 6 always passed a symbol. This means that some apps relied on symbols to be passed, this change is intended to note the change in behaviour so that apps can respond in kind.

Closes #36806.

This 6.x seems to be confusing to some people.

Remove misleading documentation [ci skip]

Sync parallel test DBs to schema using SHA

Fix test schema loading for multi-db

Sync test DB from schema using its SHA1

Raise TypeError instead of infinite loop in resolve_connection

Rails HTML sanitizer update changes to Gemfile lock on bundle install.

Actually, `first` taking non-deterministic result is considered a bug to
me. But changing the behavior should not be happened in rc2.

I've restored the behavior for 6.0, and then will deprecate that in 6.1.

Fixes #36802.

Use media_type instead of content_type internally

Rails now requires 1.2.0 because it relies on the safe_list_sanitizer
API exclusively.

Also raise `sanitizer_vendor` API from the dead for
rails-deprecated_sanitizer.

Fixes https://github.com/rails/rails-deprecated_sanitizer/pull/6

This constant doesn't exists.

Fixed cache_store name used in adding other modules section of api app documentation guide. [ci skip]

[ci skip] Mention `context` option of save in documentation

Fix GROUP BY aggregation alias to not duplicate "_" chars

Fix thread safety of prevent_writes

The PR #36860 changed ActionView's required version of
rails-html-sanitizer, but I missed that we needed to run
bundle, otherwise we end up with changes every time.