luajit: bump new version

* Actually implement maxirconst trace limit.
* Fix string.char() recording with no arguments.

Closes #6371
Part of #6548

changelogs/unreleased/gh-6371-fix-string.char-recording-wo-args.md

+## bugfix/luajit
+
+* `string.char()` builtin recording is fixed in case when no arguments are
+  given (gh-6371, gh-6548).

changelogs/unreleased/luajit-fix-maxirconst-limit.md

+## bugfix/luajit
+
+* Actually made JIT respect `maxirconst` trace limit while recording (gh-6548).

luajit @ b1750041

-Subproject commit 9a2197beeb52a9422cce87a87bfc6137347bf8ae
+Subproject commit b1750041e76c07e4f704e468a146f6259c9ba5ab