luajit: bump new version

* memprof: add info about trace start to symtab
* memprof: group allocations on traces by traceno
* memprof: refactor location parsing
* test: separate memprof Lua API tests into subtests

Closes #5814

changelogs/unreleased/gh-5814-memprof-group-allocation-on-traces.md

+##feature/luajit
+
+* Now memory profiler records allocations from traces grouping them by the
+  trace number (gh-5814). The memory profiler parser can display the new type
+  of allocation sources in the following format:
+  ```
+  | TRACE [<trace-no>] <trace-addr> started at @<sym-chunk>:<sym-line>
+  ```

luajit @ 8304ca95

-Subproject commit 6008b0ae432222ac320ae56878c772bbc25a77d6
+Subproject commit 8304ca95c6c5bbdaf3b42c5c18aa9d6e31ea56e1