revert(CPD-31586): chillerlan/php-qrcode back to v4

[thaifanisalla]

Reverts the v4 -> v5 upgrade released in 3.0.5. Restores the ^4.3 constraint and the plain QROptions render path, dropping the GDIMAGE_PNG/imageTransparent defaults that only exist in v5.

The explicit ?string $file nullable type is kept, since it is independent of the qrcode major version and avoids a PHP 8.4+ deprecation notice.

Reverts a296af9 (#65)

Greptile Summary

Reverts chillerlan/php-qrcode from v5 to v4 and restores the plain v4 QROptions rendering path while retaining the nullable file parameter.

• Changes the Composer constraint from ^5.0 to ^4.3.
• Removes v5-specific output-interface and transparency defaults.
• Leaves the restored default PNG path dependent on an undeclared GD extension.

Confidence Score: 4/5

The undeclared GD dependency should be fixed before merging because supported installations can otherwise fail on the documented default QR-rendering path.

The downgrade restores a GD-backed default renderer, while Composer permits installation without GD and the public render API invokes that renderer without selecting a non-GD alternative.

Files Needing Attention: composer.json

Important Files Changed

Filename	Overview
composer.json	Restores php-qrcode v4 but does not declare ext-gd, which its documented default PNG path requires at runtime.
src/GenerateQrCode.php	Restores the v4-compatible plain QROptions render path and retains the explicitly nullable file parameter.

Prompt To Fix All With AI

### Issue 1
composer.json:28-31
**GD dependency remains undeclared**

If a consumer installs this package without `ext-gd`, Composer accepts the installation but php-qrcode v4's default PNG renderer fails when the documented no-options `render()` path is called.

```suggestion
        "ext-dom": "*",
        "ext-gd": "*",
        "robrichards/xmlseclibs": "^3.1",
        "josemmo/uxml": "^0.1.4",
        "chillerlan/php-qrcode": "^4.3",
```

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

_{Reviews (1): Last reviewed commit: "revert(CPD-31586): `chillerlan/php-qrcod..." | Re-trigger Greptile}

Greptile also left 1 inline comment on this PR.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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🟢 Metrics 0 complexity · 0 duplication

Metric	Results
Complexity	0
Duplication	✅ 0 (≤ 2 duplication)

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