Bump third_party/imgui/repo from `3c435c0` to `092c88d` #1185

Job	Run time
REPL Tests - Linux	1h 3m 17s
Test Suites - Darwin (no-ble-asan-clang)	1h 14m 45s
Test Suites - Linux (no-ble-tsan-clang)	1h 37m 56s
REPL Tests - Darwin	0s
Test Suites - Darwin (no-ble-tsan-clang)	1h 52m 0s
	5h 47m 58s

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