patch 8.2.1473: items in a list given to :const can still be modified

Problem:    Items in a list given to :const can still be modified.
Solution:   Work like ":lockvar! name" but don't lock referenced items.
            Make locking a blob work.
diff --git a/src/version.c b/src/version.c
index 92649a3..d57661b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1473,
+/**/
     1472,
 /**/
     1471,