chore: APM agent json server schema 560cc4b604ede25ec70afd09f213d892f... (#3918)

... 30ceedc

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Author: elastic-observability-automation[bot]

apm-agent-core/src/test/resources/apm-server-schema/current/span.json

@@ -188,6 +188,9 @@
                 "object"
               ],
               "properties": {
+                "body": {
+                  "description": "The http request body usually as a string, but may be a dictionary for multipart/form-data content"
+                },
                 "id": {
                   "description": "ID holds the unique identifier for the http request.",
                   "type": [