test(cache): add delay to wildcard pattern test to prevent flakiness

Add 10ms delay after deleteAll() to let filesystem operations settle
before checking results. Prevents race condition where cacache filesystem
operations haven't fully completed.

Author: jdalton

test/unit/cache-with-ttl.test.ts

@@ -269,6 +269,9 @@ describe.sequential('cache-with-ttl', () => {
 
       await cache.deleteAll('npm/lodash/*')
 
+      // Small delay to let filesystem operations settle (prevents flakiness)
+      await new Promise(resolve => setTimeout(resolve, 10))
+
       expect(await cache.get('npm/lodash/1.0.0')).toBeUndefined()
       expect(await cache.get('npm/lodash/2.0.0')).toBeUndefined()
       expect(await cache.get('npm/react/1.0.0')).toBe('data3')