fix(sdmx_series_ecb_rir): refresh content digest after key strip

sdmx_series_ecb_rir/meta.json

@@ -51,8 +51,8 @@
   "build": {
     "built_at": "2026-06-18T22:34:51.778843Z",
     "parsimony_version": null,
-    "builder": null,
-    "content_sha256": "a677eb42819a32988597f7ba6ea552e0c2d1f564d47d680a2a5f7688b57f636a",
+    "builder": "strip-ecb-flow-prefix-keys",
+    "content_sha256": "66ff79493128c84246cd25bde72da172d1d835290c97c0d4d693fb0c7ee428d9",
     "manifest_contract_sha256": "74587e25518af2294fc417da7a8a0eee28a05fd69c64018e40355ccb814fe474"
   }
 }