Support build 4.0.0

[lume-code]

Currently, graphql_codegen pins build to <4.0.0, which prevents upgrading to the latest build_runner releases. The build package recently reached 4.x, and build_runner ^2.8.0+ depends on it.

There have been a number of improvements and fixes in recent build_runner versions (e.g., performance improvements, updated analyzer). Allowing build: ^4.0.0 would enable consumers of graphql_codegen to benefit from those improvements without version resolution conflicts.

I tried to submit a pull request, but running the tests against the updated v4 build resulted in failure.

[github-actions]

👋 @lume-code
Thank you for raising an issue. I will investigate the issue and get back to you as soon as possible.
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[budde377]

Another month another major release of build. Good times!

Please try and your PR and I can take a look at the errors.

[lume-code]

Sure, thanks :)