Gravity Forms Mailchimp Addon 5.5.0

- Fixed an issue where the status of an existing subscribed list/audience member changes to pending when double opt-in is enabled on the feed.
- Reminder: The gform_mailchimp_args_pre_subscribe filter is deprecated and will be removed in a future version. Please use the [gform_mailchimp_subscription](https://docs.gravityforms.com/gform_mailchimp_subscription/) filter instead.

- Updated feed processing to include the tags in the request to the add/update member endpoint instead of making a separate request to the member tags endpoint.

- Fixed a `Using ${var} in strings is deprecated, use {$var} instead` deprecation notice with PHP 8.2.