patch 8.2.0684: Vim9: memory leak when using lambda

Problem:    Vim9: memory leak when using lambda.
Solution:   Move the funccal context to the partial. Free the function when
            exiting.
diff --git a/src/version.c b/src/version.c
index ae08554..2bccb32 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    684,
+/**/
     683,
 /**/
     682,