Update `transparency.org` URLs in zambia-election-monitoring.md

[sloncocs]

• [ ] make sure that outreach happens
• [ ] when merging, double check that the publication date is today

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
ooni-org	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 2, 2024 6:51am