Fix next/try.alt.sh, update try script versions

The try.alt.sh used 'make all' and it also called './prog' and not
'./prog.alt'.

The version for both try.sh and try.alt.sh were updated. Presumably
before the contest is opened this will change again (or not due to this)
but since I edited the try.alt.sh and updated the version it seems
fitting to update the try.sh version too.

next/try.sh

@@ -4,7 +4,7 @@
 
 # XXX - NOTE: please remove all "XXX - ... - XXX" lines, including this one - XXX
 # XXX -                                                                     - XXX
-# XXX - try.sh example version: 28.1.1 2024-07-06                           - XXX
+# XXX - try.sh example version: 29.0.0 2025-11-24                           - XXX
 
 # make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
 # this way allows us to have the user specify a different compiler in an easy way.