Update RT-21 version

rotators/rotorez/rotorez.c

@@ -310,7 +310,7 @@ const struct rot_caps rt21_rot_caps =
     ROT_MODEL(ROT_MODEL_RT21),
     .model_name =       "RT-21",
     .mfg_name =     "Green Heron",
-    .version =      "20210801.0",
+    .version =      "20220104.0",
     .copyright =        "LGPL",
     .status =       RIG_STATUS_STABLE,
     .rot_type =     ROT_TYPE_OTHER,