Nutshell cleanup wishlist #68

Job	Run time
checks / formatting	27s
checks / ruff	8s
checks / mypy	40s
regtest (3.10, 1.7.1, CoreLightningRestWallet) / regtest	2m 54s
regtest (3.10, 1.7.1, LNbitsWallet) / regtest	2m 37s
regtest (3.10, 1.7.1, LndRestWallet) / regtest	2m 32s
tests (ubuntu-latest, 3.10, 1.7.1, FakeWallet) / poetry	1m 31s
tests (ubuntu-latest, 3.9, 1.7.1, FakeWallet) / poetry	1m 38s
	12m 27s

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