patch 8.2.0711: temp directory might be cleared

Problem:    With a long running Vim the temp directory might be cleared on
            some systems.
Solution:   Lock the temp directory. (closes #6044)
diff --git a/src/version.c b/src/version.c
index 2004f56..d63cc8b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    711,
+/**/
     710,
 /**/
     709,