Update go_router/lib/src/misc/extensions.dart

[hashemim66110]

change pushReplacementNamed type from void to Future<T?> and added returnValue to pushReplacementNamed method.

i was making a program and i need to pushReplacementNamed in a part of it. i checked the Documentation and it says the method pushReplacementNamed is returning a value. but when i tried to use it by context extensions it didn't return a value and got an error saying this method is void and doesn't return a value. so i simply updated method to return a value.

i didn't found any related open issue in issue board.

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[stuartmorgan-g]

Thanks for the submission!

In the future, please do not delete the checklist that is in the PR template; it is there for a reason. This PR is missing required elements described in the checklist (I’ve restored it to the PR description), which need to be addressed before it moves forward with review.

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