v1.2. - Homogerneize maintainers in sdl recipe

[ymontmarin]

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.

[ymontmarin]

@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.

[traversaro]

I am not sure, but I think only maintainers on the main branch are considered.

[ymontmarin]

Ready to merge --> see discussion in conda-forge/staged-recipes#29061

[Tobias-Fischer]

With the additional maintainers here, could you please remove me from the list? :)

[traversaro]

@ymontmarin I would keep the updated mantainers list just in main, the mantainers list in other branches are basically ignored and just handling all the changes (such as @Tobias-Fischer request here) in three branches just is additional work.