[CI] fix toolchain and enable cache for nightly

Author: akru

.github/workflows/nightly.yml

@@ -64,6 +64,8 @@ jobs:
         uses: houseabsolute/actions-rust-cross@v1
         with:
           command: build
+          toolchain: "1.88"
+          use-rust-cache: true
           target: ${{ matrix.platform.target }}
           args: "--locked --profile production"
           strip: true