[swift5] Fix missing case for FormDataEncoding#encode

[denizdogan]

Fixes #11062

@4brunu

[4brunu]

Looks good to me 👍

[4brunu]

@denizdogan could you please also fix the Alamofire implementation please?

openapi-generator/modules/openapi-generator/src/main/resources/swift5/libraries/alamofire/AlamofireImplementations.mustache

Lines 104 to 121 in 2ff6f83

	let upload = manager.upload(multipartFormData: { mpForm in
	for (k, v) in self.parameters! {
	switch v {
	case let fileURL as URL:
	if let mimeType = self.contentTypeForFormPart(fileURL: fileURL) {
	mpForm.append(fileURL, withName: k, fileName: fileURL.lastPathComponent, mimeType: mimeType)
	} else {
	mpForm.append(fileURL, withName: k)
	}
	case let string as String:
	mpForm.append(string.data(using: String.Encoding.utf8)!, withName: k)
	case let number as NSNumber:
	mpForm.append(number.stringValue.data(using: String.Encoding.utf8)!, withName: k)
	default:
	fatalError("Unprocessable value \(v) with key \(k)")
	}
	}
	}, to: URLString, method: xMethod, headers: nil)

It should be a new case like this? (I didn't compile it, so I'm not sure if the syntax is correct)

                         case let data as Data: 
                             mpForm.append(data, withName: k) 

[denizdogan]

@4brunu Nice catch. I don't speak Alamofire, so thanks for that! Fixed