add tests on Ordered Multiple/Collection with rdflib v2.3.8

[bourgeoa]

Ordered Multiple/Collection field does not serialize as proper RDF list issue #737
Should be resolved with rdflib v2.3.8

[Copilot]

Pull request overview

Adds unit tests covering the ordered Multiple/Collection rendering flow in widgets/forms, validating behaviour relied upon by the rdflib v2.3.8 / solid-logic v4.0.7 upgrade. Also bumps the corresponding peerDependency ranges.

Changes:

• Bump rdflib peer dep to ^2.3.8 and solid-logic to ^4.0.7.
• Add a new test suite test/unit/widgets/forms/multiple.test.ts covering Collection recovery, refresh wiring, and add-button end-to-end behaviour.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
package.json	Updates rdflib and solid-logic peerDependency versions.
test/unit/widgets/forms/multiple.test.ts	New tests for ordered Multiple field: Collection reuse, refresh method, and add-button creating a single list head.

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