Replace react-test-renderer/shallow import

Proprietary

Changes import of shallow renderer from react-test-renderer/shallow to the standalone react-shallow-renderer package, as it was removed from React 19.

org.openrewrite.react.19.replace-react-shallow-renderer
mod run . --recipe=org.openrewrite.react.19.replace-react-shallow-renderer

Install it once, then run it on every repository under the current directory. New to the Moderne CLI? Set it up.