Update heck requirement from 0.4 to 0.5

[dependabot[bot]]

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[GodotRust]

API docs are being generated and will be shortly available at: https://godot-rust.github.io/docs/gdnative/pr-1070

[chitoyuu]

The clippy failure seems to be an ICE. A quick search didn't return any related reports. The error message seemed to indicate that the problem is related to by_class_name in gdnative_core::object. I'll try and see if I can create a reproduction example, or otherwise report it directly to upstream if I can't.

[Bromeon]

@dependabot rebase