patch 8.2.2031: some tests fail when run under valgrind

Problem:    Some tests fail when run under valgrind.
Solution:   Avoid timing problems.
diff --git a/src/version.c b/src/version.c
index f2a3ba8..14eb313 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2031,
+/**/
     2030,
 /**/
     2029,