Upgrade alpine base images from 3.19 → 3.20

[sharnoff]

Current status:

• Everything up to 3.19 seems to work ok
• 3.20 usually fails the live migration e2e test
  • Haven't thoroughly debugged it — the migration object gets stuck in "pending" after syncing CPU/memory.

Once we have fewer large in-flight PRs, I'd like to start merging version bumps one at a time, so that if there's any issues it should be easier to narrow down the cause.

Ref #900

[github-actions[bot]]

Merging this branch will not change overall coverage

Impacted Packages	Coverage Δ	:robot:
github.com/neondatabase/autoscaling/neonvm/tools/vm-builder	0.00% (ø)

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Coverage by file

### Changed files (no unit tests) | Changed File | Coverage Δ | Total | Covered | Missed | :robot: | |--------------|------------|-------|---------|--------|---------| | github.com/neondatabase/autoscaling/neonvm/tools/vm-builder/main.go | 0.00% (ø) | 180 | 0 | 180 | | _Please note that the "Total", "Covered", and "Missed" counts above refer to ***code statements*** instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code._

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