fix(rust): cap tokio-util below 0.7.20 to keep the 1.83 MSRV

[ChiragAgg5k]

tokio-util 0.7.20 requires rustc 1.85, while generated Rust SDKs declare rust-version = "1.83" and publish with 1.83. It broke the sdk-for-rust 0.16.0 publish. Capping it alongside hyper-util keeps generated SDKs building on 1.83.

Same change in the SDK repo: appwrite/sdk-for-rust#32

Closes #2002

Related: #2002

[hansi-codes]

🟢 Tier S · Ready to merge

No defects found in the dependency constraint.

The Rust Cargo manifest template now constrains tokio-util to versions below 0.7.20. This keeps generated SDK dependency resolution compatible with the declared Rust 1.83 MSRV.

Verdict	New comments	Fixed	Still open
✅ Approved	0	0	0

📂 Walkthrough · 1

File	Change
templates/rust/Cargo.toml.twig	Adds a tokio-util version constraint to the generated Rust dependency list.

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[hansi-codes]

🟢 Tier S · Looks good to merge. Summary