ci: comment the `dump(fixed_array)` call in crypto_rand_read_test.v

vlib/crypto/rand/crypto_rand_read_test.v

@@ -2,13 +2,13 @@ import crypto.rand
 
 fn test_reading() ? {
 	a := rand.read(32) ?
-	dump(a.hex())
+	// dump(a.hex())
 	assert a.len == 32
 	mut histogram := [256]int{}
 	for b in a {
 		histogram[b]++
 	}
-	dump(histogram)
+	// dump(histogram)
 	for h in histogram {
 		assert h < 10
 	}