Adjust nuget.config restore path

.vsts-ci.yml

@@ -21,15 +21,16 @@ jobs:
 
   - task: NuGetToolInstaller@0
     inputs:
-      versionSpec: 4.7.0
+      versionSpec: 4.9.1
       checkLatest: false
 
   - task: NuGetCommand@2
     inputs:
       command: restore
       solution: src/Uno.UI.sln
-      selectOrConfig: select
+      nugetConfigPath: src/nuget.config
       includeNuGetOrg: true
+      disableParallelProcessing: true
       verbosityRestore: Normal
 
   - task: MSBuild@1
@@ -173,8 +174,9 @@ jobs:
     inputs:
       command: restore
       solution: src/Uno.UI.sln
-      selectOrConfig: select
+      nugetConfigPath: src/nuget.config
       includeNuGetOrg: true
+      disableParallelProcessing: true
       verbosityRestore: Normal
 
   - task: MSBuild@1

src/nuget.config

@@ -2,6 +2,6 @@
 <configuration>
   <packageSources>
     <add key="NuGet official package source" value="https://api.nuget.org/v3/index.json" />
-    <add key="Solution Packages" value=".\PackageCache" />
+    <add key="Solution Packages" value="PackageCache" />
   </packageSources>
 </configuration>