Bump @babel/core from 7.20.12 to 7.21.0

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.20.12 to 7.21.0.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.21.0/packages/babel-core)

---
updated-dependencies:
- dependency-name: "@babel/core"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package.json

@@ -72,7 +72,7 @@
     "@ava/babel": "2.0.0",
     "@ava/typescript": "^3.0.1",
     "@babel/cli": "7.20.7",
-    "@babel/core": "7.20.12",
+    "@babel/core": "7.21.0",
     "@babel/plugin-proposal-class-properties": "^7.18.6",
     "@babel/plugin-proposal-numeric-separator": "^7.18.6",
     "@babel/plugin-proposal-object-rest-spread": "^7.20.7",