fix: use `fetch` instead of `fetchWithRetries` in SiteHeaderMenus
fix: use `fetch` instead of `fetchWithRetries` in SiteHeaderMenus

There is some Safari bug on both macOS and iOS that leads to a `(0,m.fetchWithRetries) is not a function.` error.

Slack discussion: https://owid.slack.com/archives/CQQUA2C2U/p1643017308010200

Error on Bugsnag: https://app.bugsnag.com/our-world-in-data/our-world-in-data-website/errors/61e8217018e327000758b9e3

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