no flag for frozen lockfile

since pnpm already does this by default for ci

Author: pcattori

.github/workflows/ci.yaml

@@ -31,7 +31,7 @@ jobs:
           node-version: 20
           cache: "pnpm"
       - name: Install dependencies
-        run: pnpm install --frozen-lockfile
+        run: pnpm install
       - name: Install Playwright Browsers
         run: pnpm playwright install --with-deps ${{ matrix.browser }}
       - name: Run Playwright tests