🐛Fix precision of Volume.CubicInch (#1358)

Fixes #1357

An imprecise value was used, fixed by using the definition of inch as 2.54e-2 per meter.
Verified that the related unit CubicFoot is already precise.

Author: angularsen

Common/UnitDefinitions/Volume.json

@@ -194,8 +194,8 @@
     {
       "SingularName": "CubicInch",
       "PluralName": "CubicInches",
-      "FromUnitToBaseFunc": "{x} * 1.6387 * 1e-5",
-      "FromBaseToUnitFunc": "{x} / (1.6387 * 1e-5)",
+      "FromUnitToBaseFunc": "{x} * 1.6387064e-5",
+      "FromBaseToUnitFunc": "{x} / 1.6387064e-5",
       "Localization": [
         {
           "Culture": "en-US",

UnitsNet.NanoFramework/GeneratedCode/Quantities/Volume.g.cs

@@ -17,7 +17,7 @@ public class VolumeTests : VolumeTestsBase
 
         protected override double CubicFeetInOneCubicMeter => 35.314666721488590250438010354003;
 
-        protected override double CubicInchesInOneCubicMeter => 61023.98242;
+        protected override double CubicInchesInOneCubicMeter => 61_023.744094732283952756881891717;
 
         protected override double CubicKilometersInOneCubicMeter => 1E-9;