chore(deps): update to require PHP 8.4

[owenvoke]

PHP 8.4 is the minimum PHP version in our apps, it makes sense to bump to this version.

[Copilot]

Pull Request Overview

Updates the minimum PHP version requirement from 8.2/8.3 to 8.4 across the project to align with the organization's standardized PHP version.

• Updated PHP version constraints in dependency management
• Updated Docker base image to use PHP 8.4
• Updated GitHub Actions workflows to use PHP 8.4

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
docker/Dockerfile	Updates Docker base image from php:8.2-cli-alpine to php:8.4-cli-alpine
composer.json	Updates PHP version constraint from ^8.2 to ^8.4
.github/workflows/static.yml	Updates PHP version in static analysis workflow from 8.3 to 8.4
.github/workflows/main.yml	Updates PHP version in main workflow from 8.3 to 8.4

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