chore: remove rust setup

Author: qevolg

.github/workflows/build.yml

@@ -70,10 +70,6 @@ jobs:
           sudo timedatectl set-timezone Asia/Shanghai
           sudo date
 
-      - name: Set up Rust
-        id: setup-rust
-        uses: dtolnay/rust-toolchain@stable
-
       - name: Checkout Rust connector
         env:
           BRANCH_NAME: ${{ github.head_ref || github.ref_name }}