chore(deps): update test-infra random provider to v3.6.3 (#753)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| random | required_provider | patch | `3.6.2` -> `3.6.3` |

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.github/test-infra/buckets-iac/main.tf

@@ -20,7 +20,7 @@ terraform {
 
     random = {
       source  = "hashicorp/random"
-      version = "3.6.2"
+      version = "3.6.3"
     }
   }
 }