build(deps): bump @emotion/core from 10.1.1 to 11.0.0

Bumps [@emotion/core](https://github.com/emotion-js/emotion) from 10.1.1 to 11.0.0.
- [Release notes](https://github.com/emotion-js/emotion/releases)
- [Changelog](https://github.com/emotion-js/emotion/blob/master/CHANGELOG.md)
- [Commits](https://github.com/emotion-js/emotion/compare/@emotion/core@10.1.1...@emotion/core@11.0.0)

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

packages/example/package.json

@@ -3,7 +3,7 @@
   "version": "0.7.2",
   "private": true,
   "dependencies": {
-    "@emotion/core": "^10.0.17",
+    "@emotion/core": "^11.0.0",
     "@emotion/styled": "^10.0.17",
     "@slate-collaborative/backend": "^0.7.2",
     "@slate-collaborative/client": "^0.7.2",