fix(sdmx_series_ecb_ewt): refresh content digest after key strip

sdmx_series_ecb_ewt/meta.json

@@ -45,8 +45,8 @@
   "build": {
     "built_at": "2026-06-18T22:30:47.933745Z",
     "parsimony_version": null,
-    "builder": null,
-    "content_sha256": "d49548385972e17d74401c0e58161d619799eb659d6ff9c465860d133028e9d7",
+    "builder": "strip-ecb-flow-prefix-keys",
+    "content_sha256": "573ae5ee681c7d2538cd29e0176aa063d70d541328495dd4f00241f928db6158",
     "manifest_contract_sha256": "4e4095fe53b954852ea930626e9ba215f091df392e849d6b0bd291688448f5aa"
   }
 }