Update 2026-01-16-convocatoria-de-propuestas.md

[anisa-hawes]

Ampliado el plazo de presentación: 15 de marzo > 29 de marzo

I'm extending the Northern Hemisphere deadline for our convocatoria de propuestas (edición en español) until 29th March.

Closes #3731

Checklist

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[anisa-hawes]

Hola @jenniferisasi,

Are you happy with these adjustments to update the deadline?

You can also review them in the Preview.

If yes, I'll proceed to share our special posts about the ampliado el plazo de presentación!