fix: examples/eleventy/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-PUGCODEGEN-7086056
- https://snyk.io/vuln/SNYK-JS-MARKDOWNIT-6483324
- https://snyk.io/vuln/SNYK-JS-SEMVER-3247795
- https://snyk.io/vuln/SNYK-JS-NUNJUCKS-5431309
- https://snyk.io/vuln/SNYK-JS-PATHTOREGEXP-7925106
- https://snyk.io/vuln/SNYK-JS-MINIMIST-2429795
- https://snyk.io/vuln/SNYK-JS-EJS-6689533
- https://snyk.io/vuln/SNYK-JS-MINIMATCH-3050818

examples/eleventy/package.json

@@ -22,7 +22,7 @@
     "debug": "DEBUG=* eleventy"
   },
   "devDependencies": {
-    "@11ty/eleventy": "^1.0.0",
+    "@11ty/eleventy": "^3.0.0",
     "@11ty/eleventy-navigation": "^0.3.2",
     "@11ty/eleventy-plugin-rss": "^1.1.2",
     "@11ty/eleventy-plugin-syntaxhighlight": "^3.1.3",