add mahe as cilium maintainer

[xmulligan]

Checklist for maintainer updates

Leaving it up to @mtardy to do the checklist

• 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.

[xmulligan]

ref: cilium/cilium#44203

[mtardy]

Hey 👋, let me check that list:

• You've provided a link to documentation where the project has approved the maintainer changes.
  MAINTAINERS: add Mahe Tardy (mtardy) cilium/cilium#44203
• The maintainer(s) also created or updated their LFX Individual Dashboard profile.
  My profile is correct, does it need to be public? https://openprofile.dev/profile/mahe
• 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.
  Email sent!
• Optional: You've also sent a PR with affiliation updates to cncf/gitdm.
  This looks correct from a quick grep, I'm affiliated with Isovalent since 2023-01-01, which is correct.

[riaankleinhans]

Added to Service desk and mailing list.