[10.x] Fix memory leak from middlewares tempering request

[pghiuzan]

Fixes #49333

[taylorotwell]

I think it depends on where you register these call backs. They should probably be registered within the register method of a service provider. That would typically only be invoked once even when running an application within Octane or the queue.

[pghiuzan]

@taylorotwell Here's an updated example registering the callbacks within the register phase: pghiuzan/laravel-10-reproduce-memory-leak-from-middlewares-tempering-request@534911e. The problem is there even when running PHPUnit, not only Octane or queue workers.

A very similar result can be obtained by running tests on a Laravel instance with livewire/livewire:^3.2.6 installed.

[WayneHarris]

We encountered the same issue during an attempt to update Livewire 3.2 livewire/livewire#7181 and @bpotmalnik added a demo repo showing the issue livewire/livewire#7344 (comment)

[taylorotwell]

Fixed here: bb49a72