Remove Rust setup steps in Go workflow

.github/workflows/build-go.yml

@@ -26,22 +26,6 @@ jobs:
         with:
           go-version: "1.22"
           cache: false
-      - name: Set up Rust
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          components: rustfmt, clippy
-          override: true
-      - name: Cache Rust dependencies
-        uses: actions/cache@v3
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-            batcher/target
-          key: ${{ runner.os }}-rust-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-rust-
       - name: Build SP1 bindings
         run: make build_sp1_linux
       - name: Build Risc Zero go bindings