fix: capture loop variable by value in TestLockerMultipleWaiters

The loop variable `i` was captured by reference in the closure, causing
all goroutines to write to `results[9]` instead of their respective
indices. This fix captures the loop variable by value to ensure each
goroutine uses the correct index.

Author: schegi

internal/util/locker/locker_test.go

@@ -214,6 +214,8 @@ func TestLockerMultipleWaiters(t *testing.T) {
 
 		// Start multiple waiters
 		for i := range numWaiters {
+			//nolint:copyloopvar // We want to use the loop variable in the goroutine
+			i := i
 			wg.Go(func() {
 				//nolint:testifylint // Using assert in goroutine per go-require rule
 				assert.NoError(t, l.Lock(context.Background(), "test"))