Pass no-cache to the slack channels request (#934)

No cache for slack channels request

Author: valentin0h

.changeset/full-monkeys-bake.md

@@ -0,0 +1,5 @@
+---
+'@gitbook/integration-slack': minor
+---
+
+Don't cache slack channels request

integrations/slack/src/router.ts

@@ -129,6 +129,7 @@ export const handleFetchEvent: FetchEventCallback = async (request, context) =>
         return new Response(JSON.stringify(completions), {
             headers: {
                 'Content-Type': 'application/json',
+                'Cache-Control': 'no-cache',
             },
         });
     });