[go_router_builder] Update to go_router 6

[ValentinVignal]

List which issues are fixed by this PR. You must list at least one issue.

No issue but this is a follow up to #2848

If you had to change anything in the flutter/tests repo, include a link to the migration guide as per the breaking change policy.

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[flutter-dashboard]

It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie on the #hackers channel in Chat (don't just cc him here, he won't see it! He's on Discord!).

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

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[ValentinVignal]

I believe this PR can have a test exemption? Am I correct?

[chunhtai]

This migrates go_router_builder due to go_router v6 breaking changes. The existing test should be good enough.

[chunhtai]

You will need to regenerate the example/ in order to pass the ci

[ValentinVignal]

You will need to regenerate the example/ in order to pass the ci

I didn't modify any code of go_router_builder so the generated files shouldn't have changed, right? 🤔 Anyway, I tried re-generated them and I don't have any changes.
Plus, on dart_unit_tests CHANNEL:stable, the fails on /example/test/ensure_build_test.dart. The differences are on the pubspec.yaml so I'm not sure I understand what is happening 🤔 (The test is passing on my local)

[chunhtai]

ah it is the path override that causes the test to fail, it is not related to this change, sorry about the confusion. I will put up a pr to fix it.

[chunhtai]

This should fix it #2984

[Hixie]

test-exempt: rolling dependencies

[chunhtai]

The pr was merged. Can you rebase off the main branch and see if that fixes ci

[chunhtai]

it looks like your branch is still missing the latest commit 73637b8

[chunhtai]

LGTM

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