luajit: bump new version

LuaJIT submodule is bumped to introduce the following change:
* test: fix directory detection in lua-Harness suite

This changeset fixes the hidden bug in lua-Harness test suite that was
revealed by applying 9610c741 ('hotfix:
update libcurl submodule to 7.76.0'). This was 314-th patch in 2.8.0
release, so RPM-related tools confuse the testing machinery using the
patch revision in the building tree names[1].

[1]: https://github.com/tarantool/tarantool/runs/2361010932#step:5:10032

Follows up #5844

luajit @ 789820aa

-Subproject commit 3caee9ce74f854c10ac094a74ed8b7e0be5c434c
+Subproject commit 789820aac7cecc3b5ae394aadc12a5ec25b68121