fix(sdmx_series_ecb_shs): refresh content digest after key strip

sdmx_series_ecb_shs/meta.json

@@ -78,8 +78,8 @@
   "build": {
     "built_at": "2026-06-18T22:35:17.976213Z",
     "parsimony_version": null,
-    "builder": null,
-    "content_sha256": "6adafcb61cf294d5964cebf4ed8126ebcbb54ab8b851db61eaa9dc00d152ea01",
+    "builder": "strip-ecb-flow-prefix-keys",
+    "content_sha256": "16d6d2e33f6660a7ed824ab55efbf54f9354b70cbb4e5868914d4ab82b7e7353",
     "manifest_contract_sha256": "1c3e43136cf8f3b216323c41c2d311a307c2f6edb0eb62d9b463eb3142e18658"
   }
 }