fix(sdmx_series_ecb_see): refresh content digest after key strip

sdmx_series_ecb_see/meta.json

@@ -39,8 +39,8 @@
   "build": {
     "built_at": "2026-06-18T22:34:57.596084Z",
     "parsimony_version": null,
-    "builder": null,
-    "content_sha256": "7605e32b538f410a92d25187c617b80129d25a0330e5a82872915b62159bd140",
+    "builder": "strip-ecb-flow-prefix-keys",
+    "content_sha256": "e03fdf6318e15a5197a18f409e1e09b4c9065454cc1562e80929ac77f81eed59",
     "manifest_contract_sha256": "49f4f4a8f92d1edb2b294f7252436162b497d63741227de43fb4749d7707931e"
   }
 }