Update Random_Compat from 1.1.6 to 1.2.1.

Changes: https://github.com/paragonie/random_compat/compare/1.1.6...v1.2.1

See #35665.

git-svn-id: https://develop.svn.wordpress.org/trunk@36886 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/random_compat/random_bytes_libsodium.php

@@ -48,11 +48,13 @@ function random_bytes($bytes)
             'random_bytes(): $bytes must be an integer'
         );
     }
+
     if ($bytes < 1) {
         throw new Error(
             'Length must be greater than 0'
         );
     }
+
     /**
      * \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be
      * generated in one invocation.