patch 8.2.2971: cannot yank a block without trailing spaces

Problem:    Cannot yank a block without trailing spaces.
Solution:   Add the "zy" command. (Christian Brabandt, closes #8292)
diff --git a/src/version.c b/src/version.c
index 6286581..fb6d550 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2971,
+/**/
     2970,
 /**/
     2969,