Move assembly versions back to 4.14.0.0 (#78200)

Need to keep the .NET 10 SDK functional in VS 17.14 which means ensuring
that the compiler version is 4.14 for a bit longer.

Author: jaredpar

eng/Versions.props

@@ -5,8 +5,8 @@
     Roslyn version
   -->
   <PropertyGroup>
-    <MajorVersion>5</MajorVersion>
-    <MinorVersion>0</MinorVersion>
+    <MajorVersion>4</MajorVersion>
+    <MinorVersion>14</MinorVersion>
     <PatchVersion>0</PatchVersion>
     <PreReleaseVersionLabel>1</PreReleaseVersionLabel>
     <VersionPrefix>$(MajorVersion).$(MinorVersion).$(PatchVersion)</VersionPrefix>