build(deps-dev): bump release-plan in the dev-dependencies group

Bumps the dev-dependencies group with 1 update: [release-plan](https://github.com/embroider-build/release-plan).


Updates `release-plan` from 0.7.0 to 0.9.0
- [Release notes](https://github.com/embroider-build/release-plan/releases)
- [Changelog](https://github.com/embroider-build/release-plan/blob/main/CHANGELOG.md)
- [Commits](https://github.com/embroider-build/release-plan/commits)

---
updated-dependencies:
- dependency-name: release-plan
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dev-dependencies
...

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

package.json

@@ -50,7 +50,7 @@
     "execa": "^5.0.0",
     "jest": "^28.1.3",
     "prettier": "^2.7.1",
-    "release-plan": "^0.7.0"
+    "release-plan": "^0.9.0"
   },
   "engines": {
     "node": "16.* || 18.* || >=20.*"