Bump libntech from `13a9e99` to `6f49c4c` #1493

Job	Run time
shellcheck_tests / Run shellcheck on shell scripts	1m 5s
unit_tests / Run Unit Tests	1m 29s
acceptance_tests	0s
asan_unit_tests	0s
macos_unit_tests	0s
static_check	0s
valgrind_check	0s
valgrind_tests	0s
windows_acceptance_tests	0s
	2m 34s

Provide feedback