patch 8.2.2142: memory leak when heredoc is not terminated

Problem:    Memory leak when heredoc is not terminated.
Solution:   Free heredoc_trimmed.
diff --git a/src/version.c b/src/version.c
index 3aec81b..be7e4f0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2142,
+/**/
     2141,
 /**/
     2140,