Bump version to v2.8.0 (#2134)

Bumping version to 2.8.0

Author: marcelwgn

WinUIGallery/Package.Dev.appxmanifest

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10" xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest" xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10" xmlns:uap3="http://schemas.microsoft.com/appx/manifest/uap/windows10/3" 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="2.7.0.0" />
+  <Identity Name="Microsoft.WinUI3ControlsGallery.Debug" Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US" Version="2.8.0.0" />
   <mp:PhoneIdentity PhoneProductId="863667e0-667a-4bb4-ac52-c59656c7333a" PhonePublisherId="00000000-0000-0000-0000-000000000000" />
   <Properties>
     <DisplayName>WinUI 3 Gallery Dev</DisplayName>

WinUIGallery/Package.appxmanifest

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10" xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest" xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10" xmlns:uap3="http://schemas.microsoft.com/appx/manifest/uap/windows10/3" 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="2.7.0.0" />
+  <Identity Name="Microsoft.WinUI3ControlsGallery" Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US" Version="2.8.0.0" />
   <mp:PhoneIdentity PhoneProductId="863667e0-667a-4bb4-ac52-c59656c7333a" PhonePublisherId="00000000-0000-0000-0000-000000000000" />
   <Properties>
     <DisplayName>WinUI 3 Gallery</DisplayName>

WinUIGallery/WinUIGallery.csproj

@@ -756,7 +756,7 @@
 
   <!--  App Version and Assembly Info  -->
   <PropertyGroup>
-    <Version>2.7.0.0</Version>
+    <Version>2.8.0.0</Version>
     <AssemblyTitle>WinUIGallery</AssemblyTitle>
     <AssemblyProduct>WinUIGallery</AssemblyProduct>
     <AssemblyCopyright>Copyright © Microsoft Corporation. All rights reserved.</AssemblyCopyright>