Make DynamicLayout Conform to Sendable

[paulhdk]

Make DynamicLayout Conform to Sendable

♻️ Current situation & Problem

I was receiving the following error when building SpeziAccount

SpeziAccount/Sources/SpeziAccount/Views/DataEntry/DateOfBirthPicker.swift:102:17
    main actor-isolated property 'layout' can not be mutated from a Sendable closure
                    layout = value
                    ^

The reason for this appears to be that DynamicLayout does not explicitly conform to the Sendable protocol.
This PR adds explicit conformance.

Related: StanfordSpezi/SpeziAccount#82
Related but not necessarily relevant: swiftlang/swift#76648

⚙️ Release Notes

• Fix a build error in SpeziAccount

📚 Documentation

• Fix the three build errors/warnings I was receiving.

✅ Testing

With StanfordSpezi/SpeziAccount#82 and the changes in this PR, the build error(s) in SpeziAccount disappear.

📝 Code of Conduct & Contributing Guidelines

By submitting creating this pull request, you agree to follow our Code of Conduct and Contributing Guidelines:

• I agree to follow the Code of Conduct and Contributing Guidelines.

What do you think?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.91%. Comparing base (2997114) to head (5227970).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #49   +/-   ##
=======================================
  Coverage   74.91%   74.91%           
=======================================
  Files          52       52           
  Lines        1586     1586           
=======================================
  Hits         1188     1188           
  Misses        398      398           

Files with missing lines	Coverage Δ
...ources/SpeziViews/Views/Layout/DynamicHStack.swift	0.00% <ø> (ø)

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