pgvecto.rs: upgrade pgvecto.rs sdk to v0.2.2

[cutecutecat]

Here we introduce a bug fix for PGVecto.rs >= 0.4.0

If we don't need quantization, we pick a trivial option at WebUI, and this is the default behavior.

In pgvecto.rs sdk = 0.2.1, it will be translated into [indexing.ivf.quantization.trivial] or [indexing.hnsw.quantization.trivial] as toml config.

https://github.com/tensorchord/pgvecto.rs-py/blob/5e175a981b36fbb671033c2db45636a11d6dc04f/tests/__init__.py#L108

But we have a breaking change in PGVecto.rs 0.4.0, that it would not accept trivial quantization config. To express no quantization, quantization should not be showed in config.

So pgvecto.rs sdk = 0.2.2 change the behavior that will translate trivial option into [indexing.ivf] or [indexing.hnsw].

https://github.com/tensorchord/pgvecto.rs-py/blob/5bc6fc34f2d0df05701000f298596587d58acc99/tests/__init__.py#L108

This is a transparent compile inside SDK, and forward compatibility, so there is nothing to do for VectorDBBench except a upgrade.

[sre-ci-robot]

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