patch 8.2.2601: memory usage test often fails on FreeBSD

Problem:    Memory usage test often fails on FreeBSD.
Solution:   Increase multiplier for upper limit.
diff --git a/src/version.c b/src/version.c
index 72d38783..0b93372 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2601,
+/**/
     2600,
 /**/
     2599,