patch 8.2.3891: github CI: workflows may overlap

Problem:    Github CI: workflows may overlap.
Solution:   Cancel previous workflows when starting a new one. (Yegappan
            Lakshmanan, closes #9400)
diff --git a/src/version.c b/src/version.c
index dd99a31..6d23fa8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3891,
+/**/
     3890,
 /**/
     3889,