Update docs dependencies

By running 'make upgrade' command.

Author: jpraynaud

docs/package.json

@@ -14,8 +14,8 @@
     "write-heading-ids": "docusaurus write-heading-ids"
   },
   "dependencies": {
-    "@docusaurus/core": "^2.3.1",
-    "@docusaurus/preset-classic": "^2.3.1",
+    "@docusaurus/core": "^2.4.0",
+    "@docusaurus/preset-classic": "^2.4.0",
     "@docusaurus/theme-mermaid": "^2.2.0",
     "@mdx-js/react": "^1.6.22",
     "clsx": "^1.1.1",
@@ -35,4 +35,4 @@
       "last 1 safari version"
     ]
   }
-}
+}