chore(deps): update dependency @11ty/eleventy-img to v6

Author: renovate[bot]

package-lock.json

@@ -30,7 +30,7 @@
     },
     "devDependencies": {
         "@11ty/eleventy": "^2.0.1",
-        "@11ty/eleventy-img": "^4.0.0",
+        "@11ty/eleventy-img": "^6.0.0",
         "@11ty/eleventy-navigation": "^0.3.5",
         "@11ty/eleventy-plugin-bundle": "^1.0.5",
         "@11ty/eleventy-plugin-rss": "^1.2.0",