Add Support for Laravel 11

[stefanzweifel]

This PR updates the requirements in composer.json to support Laravel 11.

I ran the test suite on Github Actions in my fork. Results can be found here. (I temporarily added "minimum-stability": "dev" to run the tests)

The precedence_is_correct test is currently failing.

1) Hammerstone\Sidecar\Tests\Unit\EnvironmentTest::precedence_is_correct
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'app_env'
+'testing'

Maybe someone with more knowledge about the codebase or the new Laravel 11 changes knows what's going on here.

[stefanzweifel]

@aarondfrancis Would be awesome if you could take a look at this PR and merge / tag a new version.
I think Laravel 11 is just around the corner. 👀

[thenabeel]

@aarondfrancis Since Laravel 11 is released, is there any possibility to get this PR merged?