bump vm-builder version to v0.15.4

[fprasx]

Problem

Summary of changes

Patches a bug in vm-builder where it did not include enough parameters in the query string. These parameters are host=localhost port=5432. These parameters were not necessary for the monitor because the pq go postgres driver included them by default.

New computes should now have working monitors due to it now being able to connect to the postgres file cache.

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

[sharnoff]

PR description should describe the changes from v0.15.0-alpha1 to v0.15.4, and give some motivation as to why upgrade, but otherwise lgtm.

[github-actions]

1584 tests run: 1506 passed, 0 failed, 78 skipped (full report)

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_{The comment gets automatically updated with the latest test results
7d15334 at 2023-08-11T17:29:31.168Z :recycle:}