Nutshell cleanup wishlist #75

Job	Run time
checks / formatting	25s
checks / mypy	37s
checks / ruff	6s
regtest (3.10, 1.7.1, LNbitsWallet) / regtest	2m 51s
regtest (3.10, 1.7.1, CoreLightningRestWallet) / regtest	3m 3s
regtest (3.10, 1.7.1, LndRestWallet) / regtest	2m 45s
tests (ubuntu-latest, 3.10, 1.7.1, FakeWallet) / poetry	1m 40s
tests (ubuntu-latest, 3.9, 1.7.1, FakeWallet) / poetry	1m 41s
	13m 8s

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