Release 4.16.0

Bump version.props from 4.15.0 to 4.16.0.

Release notes (see RELEASE_NOTES.md for full details):
- Performance: replace ref cells with mutable in ofSeq, tryWith, tryFinally enumerators
- Added AsyncSeq.unzip, unzip3, map2, map3 (pending PR merge)

Co-authored-by: Copilot <[email protected]>

Author: github-actions[bot]

version.props

@@ -1,5 +1,5 @@
 <Project>
   <PropertyGroup>
-    <Version>4.15.0</Version>
+    <Version>4.16.0</Version>
   </PropertyGroup>
 </Project>