Build(deps): Bump execa from 5.1.1 to 9.4.0

Bumps [execa](https://github.com/sindresorhus/execa) from 5.1.1 to 9.4.0.
- [Release notes](https://github.com/sindresorhus/execa/releases)
- [Commits](sindresorhus/execa@v5.1.1...v9.4.0)

---
updated-dependencies:
- dependency-name: execa
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -62,7 +62,7 @@
     "chalk": "^4.1.2",
     "debug": "^4.1.1",
     "ember-cli-babel": "^8.2.0",
-    "execa": "^5.0.0",
+    "execa": "^9.4.0",
     "ncp": "^2.0.0",
     "portfinder": "^1.0.25",
     "rimraf": "^3.0.2",