[CRM-14077] Lift PHP cap to <8.4 and add 8.3 to CI

[MichaelEsteves]

Feature overview/Issue description

Part of the wings-api PHP 7.4 → 8.3 upgrade (CRM-14074, deps slice CRM-14077 group 5): this package's <8.3 PHP cap is one of the last composer-level blockers for running wings-api on 8.3.

Summary of changes

• composer.json: PHP constraint >=7.4 <8.3 → >=7.4 <8.4
• CI: PHP 8.3 added to the test matrix (where a matrix exists)

Per the epic's design (D6): constraint-lift + 8.3 CI only — code changes happen only if this package's own 8.3 CI fails.

Blockers

• After merge, please tag a release — wings-api consumes all group-5 lifts in one lock-bump PR once every tag exists.

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR lifts the PHP version constraint in composer.json from <8.3 to <8.4 and adds PHP 8.3 to the GitHub Actions CI test matrix. The constraint and CI matrix are internally consistent with each other.

• composer.json: PHP constraint updated to >=7.4 <8.4, unblocking consumption by projects running PHP 8.3.
• .github/workflows/pr_test.yml: PHP 8.3 added to the matrix.php array, providing direct CI coverage for the newly declared compatibility range.

Confidence Score: 5/5

Safe to merge — the constraint lift and CI addition are minimal, targeted, and consistent with each other.

Both changed files touch only version declarations: the composer constraint moves from <8.3 to <8.4, and the CI matrix adds 8.3 to match. No logic, no migrations, no API changes. The only noteworthy discrepancy is that the PR title and description say <8.5 while the actual code landed at <8.4; this is a stale description rather than a code defect.

No files require special attention.

Important Files Changed

Filename	Overview
composer.json	PHP constraint lifted from <8.3 to <8.4, enabling 8.3.x compatibility; note the PR title/description incorrectly states <8.5.
.github/workflows/pr_test.yml	PHP 8.3 added to the CI test matrix; consistent with the <8.4 constraint in composer.json.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[composer.json constraint] -->|was: >=7.4 <8.3| B[PHP 7.4 – 8.2 supported]
    A -->|now: >=7.4 <8.4| C[PHP 7.4 – 8.3 supported]
    D[CI matrix] -->|added: 8.3| E[Tests: 7.4, 8.0, 8.1, 8.2, 8.3]
    E -->|each with| F[prefer-lowest]
    E -->|each with| G[prefer-stable]
    C --- E

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
flowchart TD
    A[composer.json constraint] -->|was: >=7.4 <8.3| B[PHP 7.4 – 8.2 supported]
    A -->|now: >=7.4 <8.4| C[PHP 7.4 – 8.3 supported]
    D[CI matrix] -->|added: 8.3| E[Tests: 7.4, 8.0, 8.1, 8.2, 8.3]
    E -->|each with| F[prefer-lowest]
    E -->|each with| G[prefer-stable]
    C --- E

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