patch 8.2.2907: memory leak when running out of memory

Problem:    Memory leak when running out of memory.
Solution:   Free the allocated memory. (Dominique Pellé, closes #8284)
diff --git a/src/version.c b/src/version.c
index d28cddd..36979c8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2907,
+/**/
     2906,
 /**/
     2905,