Update all dependencies

This takes part of the work being done in #96 that was reverted but still useful.

Note Tailwind and Fresh weren't upgraded because there's no security vulnerability in either, and I have found the new versions to be worse in performance. Thos will likely stay at those fixed versions going forward.

routes/files/open/[fileName].tsx

@@ -37,7 +37,7 @@ export const handler: Handlers<Data, FreshContextState> = {
       return new Response('Not Found', { status: 404 });
     }
 
-    return new Response(fileResult.contents!, {
+    return new Response(fileResult.contents! as BodyInit, {
       status: 200,
       headers: {
         'cache-control': 'no-cache, no-store, must-revalidate',