os-sources: correct CentOS Stream 9 image name (the 502 was a missing file)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

deploy/os-sources.json

@@ -43,8 +43,8 @@
     "name": "centos-stream-9",
     "description": "CentOS Stream 9 GenericCloud",
     "family": "rhel",
-    "url": "https://cloud.centos.org/centos/9-stream/x86_64/images/CentOS-Stream-GenericCloud-x86_64-9-latest.x86_64.qcow2",
-    "checksum_url": "https://cloud.centos.org/centos/9-stream/x86_64/images/CentOS-Stream-GenericCloud-x86_64-9-latest.x86_64.qcow2.SHA256SUM",
+    "url": "https://cloud.centos.org/centos/9-stream/x86_64/images/CentOS-Stream-GenericCloud-9-latest.x86_64.qcow2",
+    "checksum_url": "https://cloud.centos.org/centos/9-stream/x86_64/images/CentOS-Stream-GenericCloud-9-latest.x86_64.qcow2.SHA256SUM",
     "checksum": "sha256",
     "track": "latest",
     "keep": 2