fix dead link in readme

[ZuseZ4]

Checklist

• [x ] Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

I don't think the other checklist items apply for the README

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

I do have some suggestions for making it better though...

For recipe/meta.yaml:

• ℹ️ Use of posix package on windows is deprecated. Use m2-base.
• ℹ️ The recipe is not parsable by parser conda-souschef (grayskull). This parser is not currently used by conda-forge, but may be in the future. We are collecting information to see which recipes are compatible with grayskull.
• ℹ️ The recipe is not parsable by parser conda-recipe-manager. The recipe can only be automatically migrated to the new v1 format if it is parseable by conda-recipe-manager.

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/25935014567. Examine the logs at this URL for more detail.}

[pkgw]

Thanks for catching this! The way that conda-forge works, though, you should actually modify a different file:

https://github.com/conda-forge/rust-feedstock/blob/main/recipe/meta.yaml#L262

If you update this PR to include that change, then issue a rerender command, our bot will update the README.md file appropriately.