build: update all packages, appease next build

the type checking in `next build` mistakenly thinks that we set `target`
to something older than `es2020`, so we need the `BigInt(10)` instead of
`10n` ¯\_(ツ)_/¯

.nvmrc

@@ -1 +1 @@
-18.14.2
+18.20.3

hooks/useSubscription.ts

@@ -35,7 +35,7 @@ export function useSubscription(
   paging[id] = paging[id] || {}
 
   React.useEffect(() => {
-    let timeoutId: NodeJS.Timer | null = null
+    let timer: ReturnType<typeof setTimeout> | null = null
     let stop = false
 
     async function pollEvents(): Promise<void> {
@@ -83,15 +83,15 @@ export function useSubscription(
         console.error('Poll Events: error: ', error)
       } finally {
         if (!stop) {
-          timeoutId = setTimeout(pollEvents, pollInterval)
+          timer = setTimeout(pollEvents, pollInterval)
         }
       }
     }
 
     pollEvents()
 
     return () => {
-      if (timeoutId != null) clearTimeout(timeoutId)
+      if (timer !== null) clearTimeout(timer)
       stop = true
     }
   }, [contractId, topic, onEvent, id, pollInterval])

next.config.mjs

@@ -0,0 +1,4 @@
+/** @type {import('next').NextConfig} */
+const nextConfig = {}
+
+export default nextConfig