[12.x] Remove 'wrapper' Symfony Request::get override

[jnoordsij]

This PR removes the no-op wrapper extension of the Symfony get method on the Request class, given its deprecation in Symfony 7.4 (see symfony/symfony#61948) and subsequent removal in 8.0.

Given this override is a no-op, only existing to add some notes to discourage its use (see d7d5dfc), and the Symfony counterpat deprecation should now already discourage usage through their deprecation message, this should be safely removeable.

It will remain functional with Laravel 12, but might not longer be available in v13 if that will indeed allow ^8.0 for Symfony, making it potentially worth mentioning in the upgrade guide at that point, given that it may still occur in userland code (see e.g. #57962). Alternatively, one may opt even to target this change to the master branch instead of 12.x.

[taylorotwell]

I wonder if we should just maintain it for backwards compatibility purposes?

[jnoordsij]

Given that using it was already actively discouraged by a docblock added 7+ years ago and Symfony found that removing it is warranted, removing it does not sound too harsh to me. Moreover, if Laravel 13 still would allow Symfony 7.4 as well (which it currently does), one could always pin Symfony to 7.4 in their dependencies and retain legacy compatibility for 1+ years from now.

[ziming]

I prefer the removal as sentry keep warn me and I dont want to disable deprecation warnings

[marius-ciclistu]

Request is macroable and many will choose to just copy paste the old function as a replacement leading to slower execution vs Laravel maintaining it. This forced change has no gains for the developers that use this function.