Update rust-gpu with fixed locking

[nazar-pc]

This should finally address CI flakiness (Rust-GPU/rust-gpu#631)

[Copilot]

Pull request overview

This PR updates the pinned rust-gpu git revision used by cargo-gpu-install and spirv-std to the commit that implements upstream’s “lock rustup across concurrent toolchain installs” fix (Rust-GPU/rust-gpu#631), aiming to reduce CI flakiness.

Changes:

• Bump cargo-gpu-install and spirv-std git rev in Cargo.toml to 63d5a41422010cd3f732b587b9dcd1d1a2b42de7.
• Regenerate Cargo.lock so all rust-gpu-sourced packages reference the same new rev.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
Cargo.toml	Updates the rust-gpu git revision for direct deps (cargo-gpu-install, spirv-std) to the commit containing the upstream locking fix.
Cargo.lock	Updates locked rust-gpu packages to the same new git revision to keep the dependency graph consistent/reproducible.

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