Change target label to `cyclus_dev`

[bennibbelink]

Checklist

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

I made a mistake by having the target label as dev, that way when we try to build the cycamore package downstream it not only looks for cyclus in conda-forge/label/dev but it also looks for everything else there first (which causes many dependency compatibility issues). By specifying the target label as cyclus_dev we can fetch the development version of only the cyclus package (and the main versions of our other dependencies). This strategy more closely aligns with the example in the conda-forge docs.

[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.