fix cache failing to find Cargo.toml

Author: Mec-iS

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
           path: |
             ~/.cargo
             ./target
-          key: ${{ runner.os }}-cargo-${{ matrix.platform.target }}-${{ hashFiles('Cargo.toml') }}
+          key: ${{ runner.os }}-cargo-${{ matrix.platform.target }}-${{ hashFiles('**/Cargo.toml') }}
           restore-keys: ${{ runner.os }}-cargo-${{ matrix.platform.target }}
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@stable