4.2.4

Changed

• Fixed "All output should be run through an escaping function". (f71ca74)

Composer

• Changed php from >=7.4 to >=8.0.
• Changed wp-pay/core from ^4.6 to v4.16.0.
  Release notes: https://github.com/pronamic/wp-pay-core/releases/tag/v4.16.0