Bump third_party/libdatachannel/repo from `173d97a` to `59ce380` #99430

Job	Run time
REPL Tests - Linux	1h 56m 53s
Test Suites - Darwin (no-ble-no-shell-asan-clang)	1h 24m 49s
Test Suites - Darwin (no-ble-no-shell-tsan-clang)	1h 54m 39s
Test Suites - Linux (no-ble-no-shell-tsan-clang)	1h 47m 17s
REPL Tests - Darwin	0s
	7h 3m 38s

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