libtraceevent: update to 1.9.0

libtraceevent: update to 1.9.0

Changelog:
13701b5 libtraceevent: 1.9
6a3a815 libtraceevent: Add tep_load_modules() API
31fc91b libtraceevent: Add tep_parse_last_boot_info()
5e4ef1f libtraceevent: Add tep_btf_list_args()
aa49dce libtraceevent: Split out btf func init code from tep_btf_print_args()
239b063 libtraceevent: Do not change names of functions not of this library
c284dec libtraceevent: Handle __get_stacktrace()
1ba1262 libtraceevent: Move back to 1.8.99
263459e libtraceevent: Use BTF_INT_BITS/OFFSET() when parsing int parameters
0294b73 libtraceevent utest: Add simple test to test BTF parsing
38e03ac libtraceevent: Have BTF find functions with extra characters
b441fff libtraceevent: Add man page for the new BTF functions
87f30d9 libtraceevent: Add loading of BTF to the tep handle
3488dc9 libtraceevent: Move to 1.9 devel

Link: https://github.com/openwrt/openwrt/pull/21886
Signed-off-by: Nick Hainke <vincent@systemli.org>