Update docs dependencies

Author: cmfcmf

docs/package.json

@@ -10,11 +10,11 @@
   },
   "dependencies": {
     "@cmfcmf/docusaurus-search-local": "https://github.com/cmfcmf/docusaurus-search-local",
-    "@docusaurus/core": "^2.0.0-alpha.48",
-    "@docusaurus/preset-classic": "^2.0.0-alpha.48",
+    "@docusaurus/core": "^2.0.0-alpha.56",
+    "@docusaurus/preset-classic": "^2.0.0-alpha.56",
     "classnames": "^2.2.6",
-    "react": "^16.13.0",
-    "react-dom": "^16.13.0"
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1"
   },
   "browserslist": {
     "production": [