Bump third_party/ot-br-posix/repo from `bd15f71` to `23149c3` #1469

Job	Run time
Test Suites - Darwin (no-ble-no-shell-asan-clang)	1h 13m 38s
REPL Tests - Linux	1h 57m 9s
Test Suites - Darwin (no-ble-no-shell-tsan-clang)	1h 46m 37s
Test Suites - Linux (no-ble-no-shell-tsan-clang)	1h 45m 13s
REPL Tests - Darwin	0s
	6h 42m 37s

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