[INTERNAL] Ugrade Azure Pipeline images

Some are being removed: https://devblogs.microsoft.com/devops/removing-older-images-in-azure-pipelines-hosted-pools/

Author: RandomByte

azure-pipelines.yml

@@ -9,16 +9,16 @@ trigger:
 strategy:
   matrix:
     linux_node_10:
-      imageName: 'ubuntu-16.04'
+      imageName: 'ubuntu-18.04'
       node_version: 10.x
     linux_node_latest:
-      imageName: 'ubuntu-16.04'
+      imageName: 'ubuntu-18.04'
       node_version: 12.x
     mac_node_latest:
-      imageName: 'macos-10.13'
+      imageName: 'macOS-10.15'
       node_version: 12.x
     windows_node_latest:
-      imageName: 'vs2017-win2016'
+      imageName: 'windows-2019'
       node_version: 12.x
 
 pool: