Try another toolchain format

Author: palfrey

.github/workflows/ci.yml

@@ -58,7 +58,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: "1.60"
+          toolchain: "1.60.0"
           components: clippy, rustfmt
       - uses: Swatinem/rust-cache@v1
       - name: Clippy