patch 8.2.0892: ubsan warns for undefined behavior

Problem:    Ubsan warns for undefined behavior.
Solution:   Use unsigned instead of signed variable. (Dominique Pelle,
            closes #6193)
diff --git a/src/version.c b/src/version.c
index b0fd4b3..a241fa0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    892,
+/**/
     891,
 /**/
     890,