Bump the version to 0.0.4 (#224)

Update the version of the `langchain-weaviate` package.

* Change the version in `libs/weaviate/pyproject.toml` from `0.0.3` to
`0.0.4`

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For more details, open the [Copilot Workspace
session](https://copilot-workspace.githubnext.com/langchain-ai/langchain-weaviate/pull/224?shareId=9424f1b2-c661-4d87-a9b2-84ba22038db2).