GODT-1986: Handle case where an address has no decryption entities

It's possible (but very rare, I don't think proton still allows it)
for an address to have no keys. If we try to load the address keyring
for such an address, this change logs a warning that no decryption
entities were found in the unlocked keyring.

It bumps liteapi to a version that does not return an error when no
keys could be unlocked.

internal/user/keys.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 
 	"github.com/ProtonMail/gopenpgp/v2/crypto"
+	"github.com/sirupsen/logrus"
 	"gitlab.protontech.ch/go/liteapi"
 )
 
@@ -56,6 +57,10 @@ func withAddrKRs(apiUser liteapi.User, apiAddr map[string]liteapi.Address, keyPa
 		}
 		defer addrKR.ClearPrivateParams()
 
+		if addrKR.CountDecryptionEntities() == 0 {
+			logrus.WithField("addressID", addrID).Warn("Address keyring has no decryption entities")
+		}
+
 		addrKRs[addrID] = addrKR
 	}