ci: use ordering to better cache

.github/workflows/macos.yml

@@ -30,13 +30,13 @@ jobs:
     name: Test Suite
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
           toolchain: stable
           override: true
       - uses: Swatinem/rust-cache@v2
+      - uses: actions/checkout@v3
       - uses: actions-rs/cargo@v1
         with:
           command: test