add pico_rand to kitchen_sink (#1204)

diff --git a/test/kitchen_sink/CMakeLists.txt b/test/kitchen_sink/CMakeLists.txt
index 9a465a9..4b98646 100644
--- a/test/kitchen_sink/CMakeLists.txt
+++ b/test/kitchen_sink/CMakeLists.txt
@@ -35,6 +35,7 @@
     pico_mem_ops
     pico_multicore
     pico_platform
+    pico_rand
     pico_stdlib
     pico_sync
     pico_time
diff --git a/test/kitchen_sink/kitchen_sink.c b/test/kitchen_sink/kitchen_sink.c
index 70fb168..6f23393 100644
--- a/test/kitchen_sink/kitchen_sink.c
+++ b/test/kitchen_sink/kitchen_sink.c
@@ -41,6 +41,7 @@
 #include "pico/malloc.h"
 #include "pico/multicore.h"
 #include "pico/printf.h"
+#include "pico/rand.h"
 #include "pico/runtime.h"
 #include "pico/stdio.h"
 #include "pico/stdlib.h"