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Change `context_getter` in `strawberry.fastapi.GraphQLRouter` to merge, rather than overwrite, default and custom getters.
This mean now you can always access the `request` instance from `info.context`, even when using
a custom context getter.
Contributed by [Tommy Smith](https://github.com/tsmith023) [PR #1494](https://github.com/strawberry-graphql/strawberry/pull/1494/)