chore(deps-dev): bump @aws-amplify/backend from 1.0.0 to 1.0.4 (#15)

Bumps @aws-amplify/backend from 1.0.0 to 1.0.4.

---
updated-dependencies:
- dependency-name: "@aws-amplify/backend"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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