Wallet: Strip trailing slash from URL #877

Job	Run time
checks / format	31s
checks / mypy	40s
checks / ruff	6s
regtest (3.10, 1.7.1, CLNRestWallet, postgres://cashu:cashu@localhost:5432/cashu) / regtest	5m 1s
regtest (3.10, 1.7.1, CLNRestWallet, ./test_data/test_mint) / regtest	4m 42s
regtest (3.10, 1.7.1, CoreLightningRestWallet, postgres://cashu:cashu@localhost:5432/cashu) / regtest	5m 2s
regtest (3.10, 1.7.1, CoreLightningRestWallet, ./test_data/test_mint) / regtest	4m 51s
regtest (3.10, 1.7.1, LNbitsWallet, postgres://cashu:cashu@localhost:5432/cashu) / regtest	4m 40s
regtest (3.10, 1.7.1, LNbitsWallet, ./test_data/test_mint) / regtest	4m 28s
regtest (3.10, 1.7.1, LndRestWallet, postgres://cashu:cashu@localhost:5432/cashu) / regtest	4m 39s
regtest (3.10, 1.7.1, LndRestWallet, ./test_data/test_mint) / regtest	4m 23s
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)	4m 2s
tests (ubuntu-latest, 3.10, 1.7.1, true, ./test_data/test_mint, FakeWallet) / Run (db ./test_data/test_mint, deprecated api true)	3m 54s
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)	3m 51s
tests (ubuntu-latest, 3.10, 1.7.1, false, ./test_data/test_mint, FakeWallet) / Run (db ./test_data/test_mint, deprecated api false)	3m 41s
	54m 31s

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