Fix typo

.github/workflows/build.yml

@@ -39,7 +39,7 @@ jobs:
         uses: actions/cache@v1
         with:
           path: ${{ github.workspace }}/.cache/electron-builder
-          key: ${{ runner.os }}-electron-builder-cache-${{ hashFiles(format('{0}{1}', github.workspace, '/package-lock.json'')) }}
+          key: ${{ runner.os }}-electron-builder-cache-${{ hashFiles(format('{0}{1}', github.workspace, '/package-lock.json')) }}
           restore-keys: |
             ${{ runner.os }}-electron-builder-cache-