fix(sdmx_series_ecb_car): refresh content digest after key strip

sdmx_series_ecb_car/meta.json

@@ -45,8 +45,8 @@
   "build": {
     "built_at": "2026-06-18T22:29:14.148230Z",
     "parsimony_version": null,
-    "builder": null,
-    "content_sha256": "6a797ed27f0d63869a342ef0d1e964145e863aebacec3dee91ffe368d2582d67",
+    "builder": "strip-ecb-flow-prefix-keys",
+    "content_sha256": "dd01432ff69a2e13b2acb2cf02b67d74ad8903fc579c242093e308ce90ffea2c",
     "manifest_contract_sha256": "37fe5e2b862036f703b61632ee3ddd08202f98cfff6d74376870203eb40479cb"
   }
 }