Try using npm 6.7.0 (#9823)

* Try using npm 6.7.0

* typo

Author: Danny McCormick

ci/build-all-steps.yml

@@ -15,11 +15,15 @@ steps:
     displayName: Start collect diagnostics
     condition: and(succeeded(), eq(variables.collect_diagnostics, 'true'))
 
-# Use node 8, npm 5
+# Use node 8
 - task: NodeTool@0
   displayName: Use node 8
   inputs:
     versionSpec: "8.x"
+    
+
+- script: npm i -g [email protected]
+  displayName: Use npm version 6.7.0
 
 # npm install
 - script: npm install