Bump third_party/nanopb/repo from `671672b` to `736ac3a` #1292

Job	Run time
Test Suites - Linux (no-ble-no-shell-tsan-clang)	2h 1m 3s
REPL Tests - Darwin	0s
Test Suites - Darwin (no-ble-no-shell-asan-clang)	1h 38m 37s
REPL Tests - Linux	20m 41s
Test Suites - Darwin (no-ble-no-shell-tsan-clang)	2h 13m 50s
	6h 14m 11s

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