Tests

Bump third_party/nanopb/repo from `5fd8f04` to `cf26d28` #1050

Job	Run time
REPL Tests - Linux	32m 32s
REPL Tests - Darwin	0s
Test Suites - Darwin (no-ble-asan-clang)	1h 14m 53s
Test Suites - Darwin (no-ble-tsan-clang)	1h 51m 46s
Test Suites - Linux (no-ble-tsan-clang)	1h 30m 39s
	5h 9m 50s

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