Update dependencies (#55)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: cchensh

import_map.json

@@ -1,8 +1,8 @@
 {
   "imports": {
-    "deno-slack-sdk/": "https://deno.land/x/deno_slack_sdk@2.8.0/",
+    "deno-slack-sdk/": "https://deno.land/x/deno_slack_sdk@2.9.0/",
     "deno-slack-api/": "https://deno.land/x/deno_slack_api@2.3.2/",
-    "std/": "https://deno.land/std@0.220.1/",
+    "std/": "https://deno.land/std@0.221.0/",
     "mock-fetch/": "https://deno.land/x/mock_fetch@0.3.0/"
   }
 }

slack.json

@@ -1,5 +1,5 @@
 {
   "hooks": {
-    "get-hooks": "deno run -q --allow-read --allow-net https://deno.land/x/deno_slack_hooks@1.2.3/mod.ts"
+    "get-hooks": "deno run -q --allow-read --allow-net https://deno.land/x/deno_slack_hooks@1.3.0/mod.ts"
   }
 }