ci: tweak cache keys

.github/workflows/check.yaml

@@ -80,7 +80,7 @@ jobs:
         os:
           - name: "macOS"
             runner: "macos-latest"
-            target: " x86_64-apple-darwin"
+            target: "x86_64-apple-darwin"
           - name: "Windows"
             runner: "windows-latest"
             target: "x86_64-pc-windows-msvc"
@@ -104,7 +104,7 @@ jobs:
             ~/.cargo/registry
             ~/.cargo/git
             target
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}-${{ matrix.os.target }}-${{ matrix.toolchain }}
+          key: cargo-${{ hashFiles('**/Cargo.lock') }}-${{ matrix.os.target }}-${{ matrix.toolchain }}
 
       - name: Install toolchain
         uses: actions-rs/toolchain@v1