chromium: fix typo in `update.mjs`

It's committer, not commiter.

Slipped through 9b4cbadf484fbc1af19349ff48cacfee6ff46fb6.

pkgs/applications/networking/browsers/chromium/update.mjs

···
   const response = await (await fetch(url)).text()
   const json = JSON.parse(response.replace(`)]}'\n`, ''))
 
-  const date = new Date(json.commiter.time)
+  const date = new Date(json.committer.time)
   return date.toISOString().split("T")[0]
 }