Updated Weaviate Docker image url (auto PR by bot)

[weaviate-git-bot]

This minor change updates the URL of the Weaviate Docker image.

​Instead of the standard Docker registry, Weaviate now makes use of a custom registry running at cr.weaviate.io.

Thanks in advance for ​merging.

🤖 beep boop, the Weaviate bot

PS: Please note that the Weaviate Bot automates this PR; apologies if PR formatting is missing. If you have questions, feel free to reach out via our forum or Slack.