Mint: Talk to LND via gRPC #845

Job	Run time
checks / mypy	40s
checks / format	24s
checks / ruff	5s
regtest (3.10, 1.7.1, CLNRestWallet, ./test_data/test_mint) / regtest	4m 47s
regtest (3.10, 1.7.1, CLNRestWallet, postgres://cashu:cashu@localhost:5432/cashu) / regtest	5m 8s
regtest (3.10, 1.7.1, CoreLightningRestWallet, postgres://cashu:cashu@localhost:5432/cashu) / regtest	5m 8s
regtest (3.10, 1.7.1, CoreLightningRestWallet, ./test_data/test_mint) / regtest	10m 16s
regtest (3.10, 1.7.1, LNbitsWallet, postgres://cashu:cashu@localhost:5432/cashu) / regtest	4m 48s
regtest (3.10, 1.7.1, LNbitsWallet, ./test_data/test_mint) / regtest	4m 30s
regtest (3.10, 1.7.1, LndRestWallet, postgres://cashu:cashu@localhost:5432/cashu) / regtest	4m 53s
regtest (3.10, 1.7.1, LndRestWallet, ./test_data/test_mint) / regtest	4m 31s
tests (ubuntu-latest, 3.10, 1.7.1, false, postgres://cashu:cashu@localhost:5432/cashu, FakeWallet) / Run (db postgres://cashu:cashu@localhost:5432/cashu, deprecated api false)	3m 56s
tests (ubuntu-latest, 3.10, 1.7.1, true, ./test_data/test_mint, FakeWallet) / Run (db ./test_data/test_mint, deprecated api true)	3m 37s
tests (ubuntu-latest, 3.10, 1.7.1, true, postgres://cashu:cashu@localhost:5432/cashu, FakeWallet) / Run (db postgres://cashu:cashu@localhost:5432/cashu, deprecated api true)	4m 3s
tests (ubuntu-latest, 3.10, 1.7.1, false, ./test_data/test_mint, FakeWallet) / Run (db ./test_data/test_mint, deprecated api false)	3m 42s
	1h 0m 28s

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