Update Apicurio Registry maintainers

[jsenko]

Syncs the Apicurio Registry rows in project-maintainers.csv with the project's MAINTAINERS.md.

Maintainer	GitHub	Company	Change
Eric Wittmann	EricWittmann	IBM	Update (company, handle casing)
Jakub Senko	jsenko	IBM	Update (company)
Carles Arnal	carlesarnal	IBM	Update (company)
Paolo Antinori	paoloantinori	IBM	Update (company)
Nikisha Patil	nikishapatil26	IBM	Add
Vandana Yadav	vandanayadav7	IBM	Add

Also fills in the OWNERS/MAINTAINERS column with the MAINTAINERS.md link, which was previously empty.

Checklist for maintainer updates

• 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.

Approval: the maintainer list is recorded in the Apicurio organization's maintainers.yaml and in the project's MAINTAINERS.md.

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[riaankleinhans]

@jsenko please update the maintainers at https://github.com/Apicurio/.project/blob/main/maintainers.yaml

We will automated the file in this repo this week, going forward projects would only have to update their own maintainers.yaml file and link their Github ID to their LFID at openprofile.dev. (Company affiliations are also set in their LFID)

That would automatically grant access to CNCF service desk and the project maintainers mailing list using their primary email address in their LFID.