Update dependencies (#75)

Co-authored-by: slack-samples[bot] <169401055+slack-samples[bot]@users.noreply.github.com>

slack.json

@@ -1,5 +1,5 @@
 {
   "hooks": {
-    "get-hooks": "deno run -q --allow-read --allow-net https://deno.land/x/[email protected].1/mod.ts"
+    "get-hooks": "deno run -q --allow-read --allow-net https://deno.land/x/[email protected].2/mod.ts"
   }
 }