chore: Add pandeyanshuman to Cadence project maintainers

[pandeyanshuman]

I have been a maintainer of the Cadence project for over a year.

• You've provided a link to documentation where the project has approved the maintainer changes. Cadence Maintainers List
• The maintainer(s) also created or updated their LFX Individual Dashboard profile. LFX Profile Link
• 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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[riaankleinhans]

@pandeyanshuman when receiving maintainer updates I compare all the data sources to make sure the correct people are included / excluded in the project resources (mailing list, service desk access etc.)

Comparing https://github.com/pandeyanshuman/cadence/blob/master/MAINTAINERS.md with this file the following people are listed here that are not maintainers. Can you please update the PR so the list match the repo.

Ignat Tubylov (tubignat)
Ilya Ozherelyev (3vilhamster)
Sankari Gopalakrishnan (sankari165)
Steven Littiebrant (Groxx)

Thank you.

[pandeyanshuman]

It's done, @riaankleinhans - thanks!