patch 8.2.4291: error number used twice

Problem:    Error number used twice.
Solution:   Renumber of of the errors.
diff --git a/src/version.c b/src/version.c
index 6c09fb5..1e5ac23 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4291,
+/**/
     4290,
 /**/
     4289,