fix(sdmx_series_ecb_rpv): refresh content digest after key strip

sdmx_series_ecb_rpv/meta.json

@@ -42,8 +42,8 @@
   "build": {
     "built_at": "2026-06-18T22:34:51.785062Z",
     "parsimony_version": null,
-    "builder": null,
-    "content_sha256": "8497eb6c977de291479a53b8ae3b4750e6b59c5504b380d7ab93789e8533ed4b",
+    "builder": "strip-ecb-flow-prefix-keys",
+    "content_sha256": "2db367aff339f4f14abfb1021aeb8e91d46a35580707cfb9c98afc10ffa91c6e",
     "manifest_contract_sha256": "7befc5f8be5ae4faac3f9bed6280a86859055c7ab694de652ee863a75a38fe67"
   }
 }