Widen composer/installers to 2.x and correct the demo plugin's requirements

[matteotrubini]

Allows composer/installers 2.x: the three core modules move from ~1.11.0 to ^1.11 || ^2.0.

Also corrects plugins/winter/demo/composer.json.

Summary by CodeRabbit

• Compatibility
  • Backend, CMS, and System modules now support compatible composer/installers 1.11 and 2.x releases.
  • The Demo plugin now requires PHP 8.1 or later and Winter CMS and System 1.2.8 or later (or development builds). It also supports compatible composer/installers 1.11 and 2.x releases.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 43b498b0-6764-4261-9a6d-16c5ca2bfee2

📥 Commits

Reviewing files that changed from the base of the PR and between 394ce2d and 3ce34e3.

📒 Files selected for processing (4)

• modules/backend/composer.json
• modules/cms/composer.json
• modules/system/composer.json
• plugins/winter/demo/composer.json

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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Walkthrough

The backend, CMS, and system module manifests now allow composer/installers versions matching ^1.11 or ^2.0. The demo plugin manifest raises its PHP minimum to >=8.1, adds minimum requirements for the Winter CMS and System modules, and updates its composer/installers constraint to ^1.11 || ^2.0.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 3ce34

The manifests now allow installer v2 while retaining v1, and the demo's PHP and module requirements align with the root project. Available evidence shows v2.0.0 supports the Winter package types and paths used here, with no concrete merge-blocking conflict identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes both main changes: allowing composer/installers 2.x and correcting the demo plugin requirements.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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