patch 8.1.0913: CI crashes when running out of memory

Problem:    CI crashes when running out of memory.
Solution:   Apply 'maxmempattern' also to new regexp engine.
diff --git a/src/version.c b/src/version.c
index 343270c..f60b9d6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    913,
+/**/
     912,
 /**/
     911,