max_value() is being deprecated, use ::MAX instead

[hgallagher1993]

https://doc.rust-lang.org/std/primitive.u16.html#method.max_value PR checklist:

• [ ] make succeeds (on *nix)
• [ ] make reftests succeeds
• [X] tested examples with the following backends: DX12

[kvark]

Looks like our MSRV for Naga matches this, phew! bors r+

[bors[bot]]

Build succeeded:

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