fix(routes/index): address some eslint errors

This patch addresses some ESLint errors that were a result of some lazy
third-party type definitions for `react-simple-maps`. The ideal fix for
this, of course, is to simply update those definitions upstream. That
would take a while, though, and I need to addresses these errors now.

Author: nicholaschiang

app/routes/_index/route.tsx

@@ -117,11 +117,13 @@ function Map({ className }: { className?: string }) {
         <Geographies geography={geography}>
           {({ geographies }) =>
             geographies.map((geo) => (
+              /* eslint-disable @typescript-eslint/no-unsafe-assignment */
               <Geography
-                key={geo.rsmKey}
+                key={(geo as { rsmKey: string }).rsmKey}
                 geography={geo}
                 className='fill-gray-900 dark:fill-gray-100'
               />
+              /* eslint-enable @typescript-eslint/no-unsafe-assignment */
             ))
           }
         </Geographies>