patch 8.2.5146: memory leak when substitute expression nests

Problem:    Memory leak when substitute expression nests.
Solution:   Use an array of expression results.
diff --git a/src/version.c b/src/version.c
index 0353e90..4530f8d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5146,
+/**/
     5145,
 /**/
     5144,