fix(sdmx_series_ecb_shss): refresh content digest after key strip

sdmx_series_ecb_shss/meta.json

@@ -75,8 +75,8 @@
   "build": {
     "built_at": "2026-06-18T22:35:19.543953Z",
     "parsimony_version": null,
-    "builder": null,
-    "content_sha256": "62f87bbaf952e3985ba13e5ca2a45aa067814b07d5f177847bf7d3ee7e3063ec",
+    "builder": "strip-ecb-flow-prefix-keys",
+    "content_sha256": "67ba7ac29aa00d2dcdeddd24c6a720e00e4f51de6d96a2331f568d9202bf4681",
     "manifest_contract_sha256": "84dbd75e4092ac1c10e5732ad56d8c8e3ea982102234e697cdc3ff3e7aa6f18f"
   }
 }