feat!: remove `alternate-renderers` entry point for v10

Summary

• remove the alternate-renderers entry point, which shipped a build that dropped react-dom/react-native unstable_batchedUpdates batching
• since v8 adopted useSyncExternalStore, the main entry no longer performs manual batching, so the separate entry point is redundant
• BREAKING CHANGE: the react-redux/alternate-renderers export is removed in v10; import from react-redux directly

See this GitHub comment for context.