Bump file_picker from 5.5.0 to 6.0.0

Bumps file_picker from 5.5.0 to 6.0.0.

Changelog

Sourced from file_picker's changelog.

6.0.0

Update minimum Flutter version to 3.7.0.

iOS

Update minimum iOS version to 11.0. Fix several warnings in the iOS plugin implementation.

Commits

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