The Json schema uses an unknown type int64 and double

[MadVikingGod]

Describe the bug
When trying to validate the current semantic convention with the tool ajv-cli, which is used in the Validate Json github action, the tool reports an unknown format of 'int64'.

To Reproduce
Steps to reproduce the behavior:

$ weaver -V
weaver 0.4.0
$ weaver registry json-schema -o semconv.schema.json   
$ ajv -s semconv.schema.json -d "*.yaml" --own-properties 
schema semconv.schema.json is invalid
error: unknown format "int64" ignored in schema at path "#/definitions/Examples/anyOf/1"

Expected behavior
The schema should be useable by tools outside of Weaver.

Additional context
I removed the "format": "int64" lines, and ajv complained about "format": "double" in the spec. Removing both from the generated spec allowed it to validate the model.