Updated c# language version setting to 14

Author: ncguilbeault

build/Common.csproj.props

@@ -12,7 +12,7 @@
 
   <!-- Common C# Properties -->
   <PropertyGroup>
-    <LangVersion>12.0</LangVersion>
+    <LangVersion>14.0</LangVersion>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Features>strict</Features>
     <Nullable>enable</Nullable>