remove rust-toolchain.toml

Author: macalinao

.github/workflows/ci.yml

@@ -17,10 +17,9 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@master
+        uses: dtolnay/rust-toolchain@stable
         with:
           components: rustfmt, clippy
-          toolchain: 1.89.0
 
       - name: Rust Cache
         uses: Swatinem/rust-cache@v2