Add André Silva as maintainer for OpenFeature

[askpt]

Checklist for maintainer updates

Following the recent GC elections for OpenFeature. I would like to be added to the maintainers list.
Check:

• https://openfeature.dev/community/community-members
• Update GC based on election results open-feature/community#534

Note

Delete this template if you're not changing the CSV file

• You've provided a link to documentation where the project has approved the maintainer changes.
• The maintainer(s) also created or updated their LFX Individual Dashboard profile.
• You've sent an email with the list of email address(es) to cncf-maintainer-changes@cncf.io for invitations to Service Desk and mailing lists. You can just mark this complete if you are only removing people.
• Optional: You've also sent a PR with affiliation updates to cncf/gitdm.

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[krook]

Thanks @askpt. You've been added to our maintainer records.