Update nextjs.yml

Author: JereNwa

.github/workflows/nextjs.yml

@@ -40,7 +40,7 @@ jobs:
             echo "runner=yarn" >> $GITHUB_OUTPUT
             exit 0
           elif [ -f "${{ github.workspace }}/package.json" ]; then
-            echo "manager=npm" >> $GITHUB_OUTPUT
+            echo "manager=pnpm" >> $GITHUB_OUTPUT
             echo "command=ci" >> $GITHUB_OUTPUT
             echo "runner=npx --no-install" >> $GITHUB_OUTPUT
             exit 0