build(deps-dev): 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

@@ -28,7 +28,7 @@
   "homepage": "https://github.com/synclounge/syncloungeserver#readme",
   "devDependencies": {
     "@babel/cli": "^7.21.0",
-    "@babel/core": "^7.20.12",
+    "@babel/core": "^7.21.0",
     "@babel/node": "^7.20.7",
     "@commitlint/cli": "^17.4.2",
     "@commitlint/config-conventional": "^17.4.4",