[bot]update openapi3 schema

Author: github-actions[bot]

api/build/core-openapi3.yaml

@@ -450,10 +450,9 @@ paths:
           headers:
             'X-P2-Return-Body-Size-Limit ':
               required: false
-              description: This header tells the client whether the route to commit re-signed messages has an upload size limit, and what the size of that limit is. A value of `0` means that there is no limit. This header not being present can also be interpreted as no limit existing.
+              description: This header tells the client whether the route to commit re-signed messages has an upload size limit, and what the size of that limit is, in bytes. A value of `"0"` means that there is no limit. This header not being present can also be interpreted as no limit existing. The value of this header is a string-formatted, unsigned 64-bit integer.
               schema:
-                type: integer
-                format: uint64
+                type: string
           content:
             application/json:
               schema: