fix: allow PHP 8.3 support

[callinmullaney]

Here’s a PR description following the current repo template:

Summary

• Lower the package PHP floor from ^8.4 to ^8.3 so Drupal 11 sites can install the module on PHP 8.3-supported runtimes.
• Keep Drupal 12 compatibility guarded by Drupal core's own PHP requirements, with CI coverage continuing on PHP 8.5.
• Add PHP 8.3 coverage to syntax linting, PHPCS, and the Drupal ^11.3 PHPUnit matrix.
• Configure semantic-release to create unprefixed semver tags, such as 2.1.1, and push only the generated release tag to Drupal.org.

Related Issue(s)

• None.

Validation

• composer validate --no-check-publish
• composer lint:phpcs
• composer test:unit
• composer test:deprecations
• PHP syntax lint across tracked PHP files
• Disposable Composer solve for PHP 8.3.99 with Drupal 11 dependencies
• Disposable Composer solve for Drupal 12.x-dev@dev on PHP 8.5
• npm run lint not run
• Manual Drupal verification not applicable; no Drupal UI or runtime behavior changed

Notes

• This is a fix: commit, so merging to main should trigger a patch release.
• With the current release config, the expected next tag is 2.1.1 rather than v2.1.1.
• PHP 8.3 support applies to Drupal 11. Drupal 12 compatibility continues to follow Drupal core's PHP requirements.

Security

• No security impact.
• This changes package metadata, CI coverage, documentation, and release tag handling only; it does not change access control, file-system writes, or output sanitization.

Accessibility

• No accessibility impact.
• This PR does not change UI, generated markup, focus behavior, ARIA, or frontend output.

[github-actions]

🎉 This PR is included in version 2.1.1 🎉

The release is available on GitHub release

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