fix: 패키지 관리자를 yarn에서 npm으로 변경한다

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
   ci:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@main
       name: Checkout repository
 
     - name: Cache dependencies
@@ -20,10 +20,10 @@ jobs:
           ${{ runner.os }}-nextjs-${{ hashFiles('**/package-lock.json') }}-
 
     - name: Install dependencies
-      run: yarn install --frozen-lockfile
+      run: npm install --frozen-lockfile
 
     - name: Check typescript
-      run: yarn type:check
+      run: npm run type:check
 
     - name: Check eslint
-      run: yarn lint
+      run: npm run lint