patch 8.2.1709: Vim9: memory leak when using multiple closures

Problem:    Vim9: memory leak when using multiple closures.
Solution:   Free the partial.
diff --git a/src/version.c b/src/version.c
index 2701c79..60aa105 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1709,
+/**/
     1708,
 /**/
     1707,