COMP: CI now does bootstrap-vcpkg and git pull vcpkg

Hoping to fix:

> LINK : fatal error LNK1181: cannot open input file '\lib\double-conversion.lib'

Dženan Zukić @dzenanz informed us that there was some work regarding ITK_USE_SYSTEM_DOUBLECONVERSION between IK 5.0.0 and 5.0.1, which might solve this problem.

Testing/CI/Azure/ci.yml

@@ -8,6 +8,13 @@ jobs:
   pool:
     vmImage: 'vs2017-win2016'
   steps:
+  - script: |
+      cd /d C:\vcpkg
+      git log -1
+      .\bootstrap-vcpkg.bat
+      git pull
+      git log -1
+    displayName: bootstrap-vcpkg and git pull vcpkg
   - script: |
       set VCPKG_DEFAULT_TRIPLET=x64-windows
       vcpkg.exe install itk