Please update bpftool submodule snapshoot, it renders bpftime uncompilable

[DanPartelly]

When compiling with -Werror, the bundled ebpftool submodule contains the bug below, it was fixed upstream some time ago. Please consider updating it.

prog.c: In function ‘profile_open_perf_events’:
prog.c:2297:24: error: ‘calloc’ sizes specified with ‘sizeof’ in the earlier argument and not in the later argument [-Werror=calloc-transposed-args]
sizeof(int), obj->rodata->num_cpu * obj->rodata->num_metric);