message: fix(react): Remove unnecessary `null` in `FallbackRender`'s `error` type
  We already know `error` exists because of the `if (error)` check.
  Fixes
diff: @@ -4,8 +4,8 @@ import * as React from 'react';
  export const UNKNOWN_COMPONENT = 'unknown';
  -export type FallbackRender = (fallback: {
  - error: Error | null;
  +export type FallbackRender = (errorData: {
  + error: Error;
  componentStack: string | null;
  eventId: string | null;
  resetError(): void;
  