Fixes #35447 - Update apipie-rails to 0.8.x

https://github.com/Apipie/apipie-rails/blob/master/CHANGELOG.md says:

• 0.6.0 gives us Ruby 3 support
• 0.7.2 upgrades the vendored bootstrap and jquery for security reasons
• 0.8.0 gives us Rails 7 support

There are some warnings about allow_blank changing.