TagsField only supports tag lists

[lllama]

API Gateway V2 APIs have their tags defined as a simple dictionary, rather than the traditional Key/Value pairing. TagsField will throw a TypeError as a result.

An example response can be seen here: https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/apigatewayv2.html#ApiGatewayV2.Client.get_apis

[jbmchuck]

See #130 (comment)