chore(build): remove unused VersionPrefix property

- Cleanup: removed `VersionPrefix` from `Directory.Build.props` as it is no longer required.

Author: j-d-ha

Directory.Build.props

@@ -1,6 +1,5 @@
 <Project>
   <PropertyGroup>
-    <VersionPrefix>1.5.0</VersionPrefix>
     <!-- SPDX license identifier for MIT -->
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <!-- Other useful metadata -->