Add stable PHP 8.4

[lhsazevedo]

Hi!

The PHP master branch breaks every now and then. This patch adds the latest 8.4 branch in the build matrix, ensuring a more reliable run for this version.

This is value of the version array after the patch:

[
  {
    "name": "master",
    "rev": "master",
    "patch": "84"
  },
  {
    "name": "8.0.30",
    "rev": "php-8.0.30",
    "patch": "80"
  },
  {
    "name": "8.1.32",
    "rev": "php-8.1.32",
    "patch": "81"
  },
  {
    "name": "8.2.28",
    "rev": "php-8.2.28",
    "patch": "82"
  },
  {
    "name": "8.3.19",
    "rev": "php-8.3.19",
    "patch": "83"
  },
  {
    "name": "8.4.5",
    "rev": "php-8.4.5",
    "patch": "84"
  }
]

Let me know if there is something else I should change.