patch 8.2.1321: GitHub CI also runs on tag push

Problem:    GitHub CI also runs on tag push.
Solution:   Skip CI on push. (Ken Takata, closes #6571)
diff --git a/src/version.c b/src/version.c
index b81ac06..db2e9b4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1321,
+/**/
     1320,
 /**/
     1319,