fix(instance): curl max local port should be 1023

[alyssais]

curl's --local-port is an inclusive range, and as the text says, Scaleway requires the source port be /below/ 1024.

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Relates OR Closes #0000

Release note for CHANGELOG:

**instance**: fix curl --local-port range in example

[remyleone]

Thanks a lot for your contribution. We are going to publish your fix using our internal system which will ensure that this change will be sent to our many references for documentation and not just only the CLI :)

[remyleone]

#3925