flail to fix "npm run compile" for test/v4/redis.test.ts

I say "flail" because I'm not sure if the
    import type ... from '@redis/client';
worked before *because `@types/redis` was installed?!*
or something else was different.

Author: trentm

plugins/node/opentelemetry-instrumentation-redis/test/v4/redis.test.ts

@@ -36,7 +36,7 @@ const instrumentation = registerInstrumentationTesting(
 );
 
 import { createClient } from 'redis';
-import type { RedisClientType } from '@redis/client';
+import type { RedisClientType } from 'redis';
 import {
   Span,
   SpanKind,