Bump ember-cli-babel from 7.23.0 to 7.26.6 in /smoke-test-app (#760)

Bumps [ember-cli-babel](https://github.com/babel/ember-cli-babel) from 7.23.0 to 7.26.6.
- [Release notes](https://github.com/babel/ember-cli-babel/releases)
- [Changelog](https://github.com/babel/ember-cli-babel/blob/master/CHANGELOG.md)
- [Commits](emberjs/ember-cli-babel@v7.23.0...v7.26.6)

---
updated-dependencies:
- dependency-name: ember-cli-babel
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]