fix(ci): disable rust-cache bin caching to fix macOS cargo resolution

[skevetter]

Summary

• Disables binary caching (cache-bin: false) in swatinem/rust-cache for both pr-ci.yml and release.yml desktop build jobs
• Fixes deterministic CI failure where cargo resolves to Homebrew's broken rustup-init shim on macOS runners (image 20260511.0048+), causing cargo metadata to fail with Usage: rustup-init[EXE] [OPTIONS]
• Root cause: rust-cache restores cached /opt/homebrew/bin/cargo (a rustup-init shim) which shadows ~/.cargo/bin/cargo (the real binary from dtolnay/rust-toolchain)

Upstream refs: actions/runner-images#14097, actions/runner-images#14099, Swatinem/rust-cache#341

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Reviewing files that changed from the base of the PR and between ab8d905 and 81b3fb3.

📒 Files selected for processing (2)

• .github/workflows/pr-ci.yml
• .github/workflows/release.yml

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