style: use .cast extension method in .from factory ctors

[halildurmus]

Description

Related Issue

Type of Change

• ✨ feat -- New feature (non-breaking change which adds functionality)
• 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)
• ❌ ! -- Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 refactor -- Code refactor
• ✅ ci -- Build configuration change
• 📝 docs -- Documentation
• 🧪 test -- Test
• 🗑️ chore -- Chore

[codecov]

Codecov Report

Merging #366 (e1e1a11) into main (364ae5a) will not change coverage.
The diff coverage is 57.14%.

@@           Coverage Diff           @@
##             main     #366   +/-   ##
=======================================
  Coverage   92.89%   92.89%           
=======================================
  Files          85       85           
  Lines        4098     4098           
=======================================
  Hits         3807     3807           
  Misses        291      291           

Files Changed	Coverage Δ
...ws_foundation/lib/src/collections/propertyset.dart	83.33% <ø> (ø)
...dows_foundation/lib/src/collections/stringmap.dart	86.66% <ø> (ø)
...ndows_foundation/lib/src/collections/valueset.dart	86.66% <ø> (ø)
...kages/windows_foundation/lib/src/iasyncaction.dart	0.00% <0.00%> (ø)
...ackages/windows_foundation/lib/src/iasyncinfo.dart	0.00% <0.00%> (ø)
...ges/windows_foundation/lib/src/ipropertyvalue.dart	99.45% <0.00%> (ø)
...ages/windows_foundation/lib/src/propertyvalue.dart	99.00% <ø> (ø)
packages/windows_foundation/lib/src/uri.dart	100.00% <ø> (ø)
.../windows_foundation/lib/src/wwwformurldecoder.dart	100.00% <ø> (ø)
packages/windows_foundation/lib/src/iclosable.dart	100.00% <100.00%> (ø)
... and 3 more

... and 1 file with indirect coverage changes

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