Update dependency @nuxtjs/robots to v5.6.0

Author: renovate[bot]

package.json

@@ -30,7 +30,7 @@
     "@nuxt/eslint": "1.11.0",
     "@nuxt/image": "2.0.0",
     "@nuxtjs/i18n": "10.2.1",
-    "@nuxtjs/robots": "5.5.6",
+    "@nuxtjs/robots": "5.6.0",
     "@nuxtjs/seo": "3.2.2",
     "@nuxtjs/sitemap": "7.4.7",
     "@semantic-release/changelog": "^6.0.3",