Fix sorting bug that would break test for certain regional settings

WixFileTests.UpdateWixVersionFile()

Author: mgnslndh

src/GitVersionCore/OutputVariables/VersionVariables.cs

@@ -111,7 +111,7 @@ public static IEnumerable<string> AvailableVariables
                     .GetProperties()
                     .Where(p => !p.GetCustomAttributes(typeof(ReflectionIgnoreAttribute), false).Any())
                     .Select(p => p.Name)
-                    .OrderBy(a => a);
+                    .OrderBy(a => a, StringComparer.Ordinal);
             }
         }