patch 8.1.1033: memory usage test may still fail on some systems

Problem:    Memory usage test may still fail on some systems. (Elimar
            Riesebieter)
Solution:   Increase tolerance from 1% to 3%.
diff --git a/src/version.c b/src/version.c
index 0ccf490..277c842 100644
--- a/src/version.c
+++ b/src/version.c
@@ -780,6 +780,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1033,
+/**/
     1032,
 /**/
     1031,