Bump codemirror from 5.63.3 to 5.64.0

Bumps [codemirror](https://github.com/codemirror/CodeMirror) from 5.63.3 to 5.64.0.
- [Release notes](https://github.com/codemirror/CodeMirror/releases)
- [Changelog](https://github.com/codemirror/CodeMirror/blob/master/CHANGELOG.md)
- [Commits](https://github.com/codemirror/CodeMirror/compare/5.63.3...5.64.0)

---
updated-dependencies:
- dependency-name: codemirror
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -46,7 +46,7 @@
     "@babel/preset-react": "^7.16.0",
     "body-parser": "^1.19.0",
     "classnames": "^2.3.1",
-    "codemirror": "^5.63.3",
+    "codemirror": "^5.64.0",
     "cookie-parser": "^1.4.6",
     "create-react-class": "^15.7.0",
     "dedent-tabs": "^0.10.1",