build(deps): bump amis from 2.2.0 to 6.4.0

Bumps [amis](https://github.com/baidu/amis) from 2.2.0 to 6.4.0.
- [Release notes](https://github.com/baidu/amis/releases)
- [Commits](baidu/amis@v2.2.0...6.4.0)

---
updated-dependencies:
- dependency-name: amis
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -34,7 +34,7 @@
     "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
     "@babel/plugin-proposal-optional-chaining": "^7.16.7",
     "@fortawesome/fontawesome-free": "^6.1.1",
-    "amis": "2.2.0",
+    "amis": "6.4.0",
     "amis-editor": "5.2.0",
     "amis-formula": "^2.2.0",
     "amis-ui": "^2.2.0",