luajit: bump new version

* FFI: Fix recording of union initialization.
* Fix maxslots when recording BC_VARG, part 2.
* Fix maxslots when recording BC_VARG.
* Fix BC_UCLO insertion for returns.
* ci: update job concurrency group definition

Part of #8825

NO_DOC=LuaJIT submodule bump
NO_TEST=LuaJIT submodule bump

changelogs/unreleased/gh-8825-luajit-fixes.md

+## bugfix/luajit
+
+Backported patches from the vanilla LuaJIT trunk (gh-8825). The following issues
+were fixed as part of this activity:
+
+* Fixed `BC_UCLO` insertion for returns.
+* Fixed recording of `BC_VARG` with unused vararg values.
+* Initialization instructions on trace are now emitted only for the first
+  member of a union.

luajit @ dcf33be9

-Subproject commit cbe58d63360ac7d6e69d76a7624addac848c9ea4
+Subproject commit dcf33be931467672bda39a6187627cb1b40bd898