Include package.json content in cache key

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         uses: actions/cache@v2
         with:
           path: '**/node_modules'
-          key: ${{ runner.os }}-cacheNodeModules2-${{ hashFiles('**/package-lock.json') }}
+          key: ${{ runner.os }}-cacheNodeModules2-${{ hashFiles('**/package-lock.json', '**/package.json') }}
           restore-keys: ${{ runner.os }}-cacheNodeModules2-
 
       - name: execute `npm ci` (1)