chore: update Windows default VHD for July (#3619)

[AbelHu]

Reason for Change:

Update to use AKS-ENGINE Windows VHD.

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[andyliuliming]

/lgtm

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This pull-request has been approved by: AbelHu, andyliuliming
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