feat: update country count

[Alessandro100]

Summary:

Update country count from 75 to 99

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• Run the unit tests with ./scripts/api-tests.sh to make sure you didn't break anything
• Add or update any needed documentation to the repo
• Format the title like "feat: [new feature short description]". Title must follow the Conventional Commit Specification(https://www.conventionalcommits.org/en/v1.0.0/).
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[github-actions]

*Lighthouse ran on https://mobility-feeds-dev--pr-1607-o8zdk4s0.web.app/ * (Desktop)
⚡️ HTML Report Lighthouse report for the changes in this PR:

Performance	Accessibility	Best Practices	SEO
🟠 77	🟢 100	🟢 100	🟢 100

*Lighthouse ran on https://mobility-feeds-dev--pr-1607-o8zdk4s0.web.app/feeds * (Desktop)
⚡️ HTML Report Lighthouse report for the changes in this PR:

Performance	Accessibility	Best Practices	SEO
🟠 64	🟢 91	🟢 100	🟢 100

*Lighthouse ran on https://mobility-feeds-dev--pr-1607-o8zdk4s0.web.app/feeds/gtfs/mdb-2126 * (Desktop)
⚡️ HTML Report Lighthouse report for the changes in this PR:

Performance	Accessibility	Best Practices	SEO
🟠 69	🔴 0	🟢 93	🟢 100

*Lighthouse ran on https://mobility-feeds-dev--pr-1607-o8zdk4s0.web.app/feeds/gtfs_rt/mdb-2585 * (Desktop)
⚡️ HTML Report Lighthouse report for the changes in this PR:

Performance	Accessibility	Best Practices	SEO
🟢 90	🟠 87	🟢 100	🟢 100

*Lighthouse ran on https://mobility-feeds-dev--pr-1607-o8zdk4s0.web.app/gbfs/gbfs-flamingo_porirua * (Desktop)
⚡️ HTML Report Lighthouse report for the changes in this PR:

Performance	Accessibility	Best Practices	SEO
🟢 99	🟢 100	🟢 100	🟢 100

[github-actions]

Preview Firebase Hosting URL: https://mobility-feeds-dev--pr-1607-o8zdk4s0.web.app

[davidgamez]

LGTM