Bump test-random-util timeout

It is using log_trace, which we enabled in the CI, so now it's
slower and it is timing out. Bump the timeout from 30s to 120s.

src/test/meson.build

@@ -160,7 +160,8 @@ tests += [
 
         [['src/test/test-random-util.c'],
          [],
-         [libm]],
+         [libm],
+         [], '', 'timeout=120'],
 
         [['src/test/test-format-table.c']],