Bump lazysizes from 4.0.2 to 5.2.1 in /website

Bumps [lazysizes](https://github.com/aFarkas/lazysizes) from 4.0.2 to 5.2.1.
- [Release notes](https://github.com/aFarkas/lazysizes/releases)
- [Changelog](https://github.com/aFarkas/lazysizes/blob/gh-pages/CHANGELOG.md)
- [Commits](https://github.com/aFarkas/lazysizes/compare/4.0.2...5.2.1)

Signed-off-by: dependabot[bot] <support@github.com>

website/package-lock.json

@@ -3879,9 +3879,9 @@
       }
     },
     "lazysizes": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/lazysizes/-/lazysizes-4.0.2.tgz",
-      "integrity": "sha512-92u9rbDVHn5iARg8xsYbXgZJLSiOVlJ9fjrC81shQsz8NmHRSlRyP6W+ztTMVEwtAdTa2knHyjw06lYOT6BMdA=="
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/lazysizes/-/lazysizes-5.2.1.tgz",
+      "integrity": "sha512-607dEMlbcnkny2lGYVqoA/rQO+WGpWh/BISeS1eLfT8nHQw6E+R8ybJoKKGVlZ2czKPTATrsU95f+nkwix0fXw=="
     },
     "lazystream": {
       "version": "1.0.0",

website/package.json

@@ -6,7 +6,7 @@
     "gulp-rename": "^1.2.3",
     "html5shiv": "^3.7.3",
     "jquery": "^3.3.1",
-    "lazysizes": "^4.0.2",
+    "lazysizes": "^5.2.1",
     "magnific-popup": "^1.1.0",
     "rename": "^1.0.4",
     "resources": "^0.4.3",