fix: maybe could get version spec

Author: nanai10a

.github/workflows/build.yml

@@ -13,7 +13,9 @@ jobs:
     timeout-minutes: 40
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@v1
+      - id: parse-toolchain
+        run: cat ./rust-toolchain.toml | awk '/channel = / { print $3 }' | xargs -I% echo spec=% >> $GITHUB_OUTPUT
+      - uses: dtolnay/rust-toolchain@${{ steps.parse-toolchain.outputs.spec }}
       - uses: Swatinem/rust-cache@v2
       - name: install native deps
         run: sudo apt update && sudo apt install clang llvm pkg-config nettle-dev