Fix sobek values for ElementHandle

[inancgumus]

What?

Fixes Sobek value usage for ElementHandle.

Why?

Fixing potential race conditions.

Checklist

• I have performed a self-review of my code.
• I have commented on my code, particularly in hard-to-understand areas.
• I have added tests for my changes.
• I have run linter and tests locally (make check) and all pass.

Checklist: Documentation (only for k6 maintainers and if relevant)

Please do not merge this PR until the following items are filled out.

• I have added the correct milestone and labels to the PR.
• I have updated the k6-documentation: grafana/k6-docs#PR-NUMBER
• I have updated the TypeScript definitions: grafana/k6-DefinitelyTyped#PR-NUMBER
• I have updated the release notes: link.

Related PR(s)/Issue(s)

• browser: Mark a bunch of places where races happen #4521
• Move Sobek entirely out of the business logic #4219
• concurrent map iteration and map write: ElementHandle.typ #4565

[mstoykov]

LGTM!

I wonder if Files needs to be a type at all or should Parse just return []File, error instead. But I guess this way it looks more like the others.

[inancgumus]

I wonder if Files needs to be a type at all or should Parse just return []File, error instead. But I guess this way it looks more like the others.

Totally agree. No need for it to be a type. I just focused on the current issue, but it definitely makes sense to remove that type.