Update Version 2.4.3 (#1570)

<!--- Provide a general summary of your changes in the Title above -->

## Description
<!--- Describe your changes in detail -->

- Change version number from 2.4.2.1 - #1568  to 2.4.3
- Turns out you can't have a non-zero revision number on Store

WinUIGallery/Package.Dev.appxmanifest

@@ -7,7 +7,7 @@
     xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
     IgnorableNamespaces="uap mp uap3">
   <!--Note: package version and assembly version must be kept in sync-->
-  <Identity Name="Microsoft.WinUI3ControlsGallery.Debug" Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US" Version="2.4.2.1" />
+  <Identity Name="Microsoft.WinUI3ControlsGallery.Debug" Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US" Version="2.4.3.0" />
   <mp:PhoneIdentity PhoneProductId="863667e0-667a-4bb4-ac52-c59656c7333a" PhonePublisherId="00000000-0000-0000-0000-000000000000" />
   <Properties>
     <DisplayName>WinUI 3 Gallery Dev</DisplayName>

WinUIGallery/Package.appxmanifest

@@ -7,7 +7,7 @@
     xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
     IgnorableNamespaces="uap mp uap3">
   <!--Note: package version and assembly version must be kept in sync-->
-  <Identity Name="Microsoft.WinUI3ControlsGallery" Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US" Version="2.4.2.1" />
+  <Identity Name="Microsoft.WinUI3ControlsGallery" Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US" Version="2.4.3.0" />
   <mp:PhoneIdentity PhoneProductId="863667e0-667a-4bb4-ac52-c59656c7333a" PhonePublisherId="00000000-0000-0000-0000-000000000000" />
   <Properties>
     <DisplayName>WinUI 3 Gallery</DisplayName>

WinUIGallery/Properties/AssemblyInfo.cs

@@ -25,6 +25,6 @@
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
 // Note: package version and assembly version must be kept in sync
-[assembly: AssemblyVersion("2.4.2.1")]
-[assembly: AssemblyFileVersion("2.4.2.1")]
+[assembly: AssemblyVersion("2.4.3.0")]
+[assembly: AssemblyFileVersion("2.4.3.0")]
 [assembly: ComVisible(false)]