ci: upgrades outdated nuget installer task

Author: baywet

.azure-pipelines/ci-build.yml

@@ -60,10 +60,10 @@ extends:
               version: 8.x
 
           # Install the nuget tool.
-          - task: NuGetToolInstaller@0
-            displayName: 'Use NuGet >=5.2.0'
+          - task: NuGetToolInstaller@1
+            displayName: 'Use NuGet >=6.11.0'
             inputs:
-              versionSpec: '>=5.2.0'
+              versionSpec: '>=6.11.0'
               checkLatest: true
 
           # Build the Product project