Build(deps): Bump @babel/core in /app/assets/javascripts (#21349)

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.21.4 to 7.21.8.
- [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/v7.21.8/packages/babel-core)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

app/assets/javascripts/pretty-text/package.json

@@ -21,7 +21,7 @@
     "xss": "^1.0.14"
   },
   "devDependencies": {
-    "@babel/core": "^7.21.4",
+    "@babel/core": "^7.21.8",
     "@ember/optional-features": "^2.0.0",
     "@ember/string": "^3.0.1",
     "@embroider/test-setup": "^2.1.1",