[tests] Bump php version test (#2734)

## Summary Hopping this fixes CICD. ## How was it tested? CICD ## Community Contribution License All community contributions in this pull request are licensed to the project maintainers under the terms of the [Apache 2 License](https://www.apache.org/licenses/LICENSE-2.0). By creating this pull request, I represent that I have the right to license the contributions to the project maintainers under the Apache 2 License as stated in the [Community Contribution License](https://github.com/jetify-com/opensource/blob/main/CONTRIBUTING.md#community-contribution-license).

Author: mikeland73

examples/plugins/builtin/devbox.d/php82/php-fpm.conf renamed to examples/plugins/builtin/devbox.d/php84/php-fpm.conf

@@ -11,7 +11,7 @@
  }
  },
  "include": [
- // Installs the php plugin using php82 as trigger package
- "plugin:php82"
+ // Installs the php plugin using php84 as trigger package
+ "plugin:php84"
  ]
 }

examples/plugins/builtin/devbox.d/php82/php.ini renamed to examples/plugins/builtin/devbox.d/php84/php.ini

@@ -1,4 +1,9 @@
 {
  "lockfile_version": "1",
- "packages": {}
+ "packages": {
+ "github:NixOS/nixpkgs/nixpkgs-unstable": {
+ "last_modified": "2025-10-23T16:27:14Z",
+ "resolved": "github:NixOS/nixpkgs/d5faa84122bc0a1fd5d378492efce4e289f8eac1?lastModified=1761236834&narHash=sha256-%2Bpthv6hrL5VLW2UqPdISGuLiUZ6SnAXdd2DdUE%2BfV2Q%3D"
+ }
+ }
 }