[v7] Bump build to 3 and rebuild with latest dartsim-cpp

[traversaro]

Workaround for robotology/robotology-superbuild#1761 . Once I rebuilt all the packages that depends on dartsim-cpp against 6.15.0, I will add it to the conda-forge-pinning so in the future this is automatically handled by ABI bots.

Checklist

• 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.

[traversaro]

@conda-forge-admin, please rerender

[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 The recipe is not parsable by parser conda-souschef (grayskull). Your recipe may not receive automatic updates and/or may not be compatible with conda-forge's infrastructure. Please check the logs for more information and ensure your recipe can be parsed.

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/12204645294. Examine the logs at this URL for more detail.}

[traversaro]

I will add it to the conda-forge-pinning so in the future this is automatically handled by ABI bots.

Related PR: conda-forge/conda-forge-pinning-feedstock#6796 .