Update to CMS RC1.

Author: AndyButland

Directory.Packages.props

@@ -12,7 +12,7 @@
   </ItemGroup>
   <!-- Umbraco packages -->
   <ItemGroup>
-    <PackageVersion Include="Umbraco.Cms.Web.Common" Version="[15.0.0--rc1.preview.16.gdcd6f1f, 15)" />
-    <PackageVersion Include="Umbraco.Deploy.Infrastructure" Version="[15.0.0--rc1.preview.9.g14f6ad3, 15)" />
+    <PackageVersion Include="Umbraco.Cms.Web.Common" Version="[15.0.0-rc1, 15)" />
+    <PackageVersion Include="Umbraco.Deploy.Infrastructure" Version="[15.0.0--rc1.preview.14.gf9ce468, 15)" />
   </ItemGroup>
 </Project>

azure-pipelines.yml

@@ -61,7 +61,6 @@ stages:
             displayName: Use .NET SDK from global.json
             inputs:
               useGlobalJson: true
-              includePreviewVersions: true
 
           # Cache and restore NuGet packages
           - task: Cache@2

tests/Directory.Packages.props

@@ -4,7 +4,7 @@
   <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Packages.props, $(MSBuildThisFileDirectory)..))" />
   <!-- Umbraco packages -->
   <ItemGroup>
-    <PackageVersion Include="Umbraco.Cms.Tests" Version="14.0.0" />
+    <PackageVersion Include="Umbraco.Cms.Tests" Version="15.0.0-rc1" />
   </ItemGroup>
   <!-- Third-party packages -->
   <ItemGroup>