fix(ci): bump Rust toolchain to 1.85.0 for edition2024 support

Rust 1.85.0 is the sweet spot:
- Supports Cargo.lock v4 format (since Rust 1.78)
- Supports edition2024 (stabilized in Rust 1.85)
- Avoids the ethnum v1.5.0 transmute bug (appeared in Rust 1.97)

Author: jobbykings

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: 1.80.0
+          toolchain: 1.85.0
 
       - name: Build contracts
         run: cd contracts && cargo build --lib
@@ -164,7 +164,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: 1.80.0
+          toolchain: 1.85.0
 
       - name: Install cargo-audit
         run: cargo install cargo-audit --version 0.21.1 --locked

.github/workflows/security.yml

@@ -118,7 +118,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: 1.80.0
+          toolchain: 1.85.0
 
       - name: Install cargo-audit
         run: cargo install cargo-audit --version 0.21.1 --locked

contracts/rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.80.0"
+channel = "1.85.0"
 targets = ["wasm32-unknown-unknown"]