Mint: invalidate and generate promises in single db transaction for s… #118

Job	Run time
checks / ruff	4s
checks / formatting	24s
checks / mypy	34s
regtest (3.10, 1.5.1, CoreLightningRestWallet) / regtest	2m 48s
regtest (3.10, 1.5.1, LNbitsWallet) / regtest	4m 13s
regtest (3.10, 1.5.1, LndRestWallet) / regtest	2m 34s
tests (ubuntu-latest, 3.10, 1.5.1, false, FakeWallet) / poetry	1m 23s
tests (ubuntu-latest, 3.10, 1.5.1, true, FakeWallet) / poetry	1m 18s
	13m 18s

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