fix: Fix for async modal roots

[just-boris]

Description

Unblocking this change: cloudscape-design/component-toolkit#172

The code needs to be updated for compatibility with the changes from another package

Related links, issue #, if available: n/a

How has this been tested?

PR build passes

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[just-boris]

The signature of this function will change. Replacing the manual signature with a type reference to mirror the signature from the upstream without copying

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.25%. Comparing base (58547d1) to head (03bbac9).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4007   +/-   ##
=======================================
  Coverage   97.25%   97.25%           
=======================================
  Files         859      859           
  Lines       25394    25394           
  Branches     9047     9048    +1     
=======================================
  Hits        24697    24697           
+ Misses        691      650   -41     
- Partials        6       47   +41     

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