backstage/.changeset/slimy-chefs-think.md

@backstage/plugin-notifications-backend-module-email, @backstage/plugin-catalog-backend-module-github, @backstage/plugin-notifications-backend, @backstage/plugin-techdocs-backend

@backstage/plugin-notifications-backend-module-email	@backstage/plugin-catalog-backend-module-github	@backstage/plugin-notifications-backend	@backstage/plugin-techdocs-backend
patch	patch	patch	patch

Refactor to use injected catalog client in the new backend system