Update GHPages.yml

Author: ota-meshi

.github/workflows/GHPages.yml

@@ -15,7 +15,7 @@ jobs:
         run: |+
           npm install --legacy-peer-deps
           npm run build
-          NODE_OPTIONS="--max-old-space-size=4096"
+          export NODE_OPTIONS="--max-old-space-size=8192"
           npm run docs:build
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3