Gravity Forms 2.8.11

- Fixed an issue with the saving of the screen options on the Forms and Entries list pages introduced by changes in WordPress 5.4.2

- Added the [gform_field_size_choices](https://docs.gravityforms.com/gform_field_size_choices/) filter allowing the choices for the Field Size setting in the form editor to be customized.

- Updated recommended minimum PHP version on the System Status page to 7.3, matching the WordPress recommendation.
- Updated minimum WordPress version on the System Status page to 5.3.
- Updated the gravityforms.php examples for defining the reCAPTCHA constants: [GF_RECAPTCHA_PRIVATE_KEY](https://docs.gravityforms.com/gf_recaptcha_private_key/) and [GF_RECAPTCHA_PUBLIC_KEY](https://docs.gravityforms.com/gf_recaptcha_public_key/).