Update dependencies (#41)

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slack.json

@@ -1,5 +1,5 @@
 {
   "hooks": {
-    "get-hooks": "deno run -q --allow-read --allow-net https://deno.land/x/deno_slack_hooks@1.2.2/mod.ts"
+    "get-hooks": "deno run -q --allow-read --allow-net https://deno.land/x/deno_slack_hooks@1.2.3/mod.ts"
   }
 }