Update dependency neighbor to '~> 0.4.0'

This MR contains the following updates:

Package	Update	Change
neighbor	minor	'~> 0.3.2' -> '~> 0.4.0'

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

ankane/neighbor (neighbor)

v0.4.0

Compare Source

• Added support for halfvec and sparsevec types
• Added support for taxicab, hamming, and jaccard distances with vector extension
• Added deserialization for cube and vector columns without has_neighbor
• Added support for composite primary keys
• Changed nearest_neighbors to replace previous order scopes
• Changed normalize option to use before_save callback
• Changed dimensions and finite values checks to use Active Record validations
• Fixed issue with nearest_neighbors scope overriding select values
• Removed default attribute name
• Dropped support for Ruby < 3.1

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