Fix snowflake/dml recipe: correct Spice Workers docs link

[claudespice]

What the recipe said

snowflake/dml/README.md linked Spice Workers at:

https://docs.spiceai.org/components/workers

What the docs do

That path 404s. The Workers documentation lives under /features/ in the current docs — /components/workers only exists in the archived v1.10 / v1.11 versioned docs (confirmed in https://spiceai.org/sitemap.xml, which lists /docs/v1.10/components/workers and /docs/v1.11/components/workers but /docs/features/workers for current).

$ curl -s -o /dev/null -w '%{http_code}' -L https://docs.spiceai.org/components/workers
404
$ curl -s -o /dev/null -w '%{http_code}' -L https://docs.spiceai.org/features/workers
200

What changed

Repointed the link to https://docs.spiceai.org/features/workers.

Verified against current stable Spice v2.1.1. This was the only components/workers reference in the cookbook — a full sweep of all 119 Spice doc URLs across every README found no other broken paths beyond the one fixed separately in postgres/accelerator.