Use new `params.expect` syntax instead of `params.require`

[jeromedalbert]

Problem

PR https://github.com/rails/rails/pull/51674 updated controller generator templates in the Rails codebase. But, as DHH explained, we need to do the same update to templates in jbuilder, because they are used by default for new Rails apps.

Solution

Port the changes from https://github.com/rails/rails/pull/51674 to this codebase, only for Rails versions 8.0+:

• Change templates to use params.expect(post: [ :title, ... ]) instead of params.require(:post).permit(:title, ...).

  Notice the spaces around [ and ] in order to be compliant with rubocop-rails-omakase rules, which are enabled by default for new Rails apps.

• Change templates to use @post = params.expect(:id) instead of @post = params[:id].

cc @martinemde

[MatheusRich]

@jeromedalbert add a Changelog entry, please

[jeromedalbert]

@MatheusRich This project does not seem to have a Changelog file. 😅

After looking at this:

https://github.com/rails/jbuilder/blob/acf44b86eebeb229dea651f2a8ec4bdd64a5328c/jbuilder.gemspec#L26

It looks like changelogs are made directly from GitHub at release time: https://github.com/rails/jbuilder/releases

So I guess I'm good on my end, but let me know if I missed something.