feat(never): remove never function

BREAKING CHANGE: `never()` has been removed finally. Just use `NEVER`.

src/index.ts

@@ -75,7 +75,6 @@ export { generate } from './internal/observable/generate';
 export { iif } from './internal/observable/iif';
 export { interval } from './internal/observable/interval';
 export { merge } from './internal/observable/merge';
-export { never } from './internal/observable/never';
 export { of } from './internal/observable/of';
 export { onErrorResumeNext } from './internal/observable/onErrorResumeNext';
 export { pairs } from './internal/observable/pairs';

src/internal/observable/never.ts

@@ -35,10 +35,3 @@ import { noop } from '../util/noop';
  * @see {@link throwError}
  */
 export const NEVER = new Observable<never>(noop);
-
-/**
- * @deprecated Replaced with the {@link NEVER} constant. Will be removed in v8.
- */
-export function never() {
-  return NEVER;
-}