Set gain to 5e-9 #5242

Job	Run time
Basic linting	40s
bittide-instances synthesis matrix generation	18s
Build dependencies	4m 34s
bittide-instances hardware-in-the-loop test matrix generation	18s
license-check	11s
bittide-experiments unittests	52s
Firmware Support Unit Tests	2m 23s
Bittide tests	7m 44s
Host Tools Unit Tests	26s
Firmware Limit Checks	39s
Rust Lints	40s
bittide-instances doctests	49s
synth (hwCcTopologyTest, test, All)	14m 36s
bittide-instances unittests	1m 34s
HITL (hwCcTopologyTest, test, All)	3m 12s
Generate clock control report	1m 7s
All jobs finished	3s
	40m 6s

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