fix: swiftlint errors in Web3+InfuraProviders.swift

Author: JeneaVranceanu

Sources/web3swift/Web3/Web3+InfuraProviders.swift

@@ -11,7 +11,9 @@ public final class InfuraProvider: Web3HttpProvider {
     public init?(_ net: Networks, accessToken token: String? = nil, keystoreManager manager: KeystoreManager? = nil) async {
         var requestURLstring = "https://" + net.name + Constants.infuraHttpScheme
         requestURLstring += token ?? Constants.infuraToken
-        let providerURL = URL(string: requestURLstring)
-        await super.init(providerURL!, network: net, keystoreManager: manager)
+        guard let providerURL = URL(string: requestURLstring) else {
+            return nil
+        }
+        await super.init(providerURL, network: net, keystoreManager: manager)
     }
 }