Update pnpm install command to avoid frozen lockfile

Author: fallow64

.github/workflows/nextjs.yml

@@ -45,7 +45,7 @@ jobs:
       - name:  Change Directory
         run: cd website
       - name: Install dependencies
-        run: pnpm install
+        run: pnpm install --no-frozen-lockfile
       - name: Build with Next.js
         run: |
           pnpm run build