build: pin tempfile to 3.14.0 for rust-toolchain 1.84.1

[pingyu]

Problem

make fails on toolchain 1.84.1 during cargo run -p tikv-client-proto-build because dependency resolution can pick tempfile 3.25.0, which pulls getrandom 0.4.1 (requires Cargo support for edition2024).

Fix

• Pin tempfile to =3.14.0 in Cargo.toml dev-dependencies.
• Add the same pin in proto-build/Cargo.toml so generate is constrained even when Cargo.lock is ignored.

This keeps compatibility with the repository's pinned rust-toolchain.toml (1.84.1) and avoids the edition2024 parse failure.

Verification

• make

Summary by CodeRabbit

• Chores
  • Updated development dependency versions for compatibility with the latest Rust toolchain.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Dependency version pinning updates across two Cargo.toml manifests. The root project pins tempfile from version "3.6" to exact version "3.14.0", while proto-build adds tempfile as a new dependency with the same pinned version "3.14.0" alongside a rust-toolchain compatibility note.

Changes

Cohort / File(s)	Summary
Dependency Version Pinning Cargo.toml, proto-build/Cargo.toml	Updated/added tempfile dependency pinned to exact version 3.14.0 in both manifests. Root file changes from flexible "3.6" to exact "=3.14.0"; proto-build adds new dependency with rust-toolchain 1.84.1 compatibility note.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A carrot of version, precisely aligned,
Dependencies bundled, no mismatch to find,
Three-fourteen-zero, locked tight with a pin,
Building with confidence—let the work begin! 📦

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: pinning tempfile to a specific version for rust-toolchain compatibility, which is the core objective of the PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into master

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✨ Finishing touches

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[coderabbitai]

🧹 Nitpick comments (1)

Cargo.toml (1)

60-60: Consider adding the same compatibility comment as in proto-build/Cargo.toml.

The sibling manifest has # Keep this compatible with rust-toolchain 1.84.1. above its tempfile pin. Adding the same note here would help future contributors understand why an exact pin is used and when it can be relaxed.

Suggested change

+# Keep this compatible with rust-toolchain 1.84.1.
 tempfile = "=3.14.0"

[pingyu]

@iosmanthus @YuJuncen PTAL~