patch 9.0.0277: Coverity CI: update-alternatives not needed with Ubuntu 20.04

Problem:    Coverity CI: update-alternatives not needed with Ubuntu 20.04.
Solution:   Remove update-alternatives for Lua. (closes #10987)
diff --git a/src/version.c b/src/version.c
index a0a7210..1fd798b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -724,6 +724,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    277,
+/**/
     276,
 /**/
     275,