bump vm-builder version to v0.16.3

[fprasx]

This change to autoscaling allows agents to connect directly to the monitor, completely removing the informant.

Problem

Summary of changes

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics? if so did you add the relevant metrics to the dashboard?
• If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section.

Checklist before merging

• Do not forget to reformat commit message to not include the above checklist

[github-actions]

1624 tests run: 1551 passed, 0 failed, 73 skipped (full report)

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_{The comment gets automatically updated with the latest test results
040e1cf at 2023-08-21T16:41:17.612Z :recycle:}

[sharnoff]

[ ... ] version t0 v0.16.3

typo in PR? :D

otherwise looks good.