[Snyk] Security upgrade stellar-sdk from 12.1.0 to 13.3.0

[Badmeed]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Predictable Value Range from Previous Values SNYK-JS-FORMDATA-10841150	863

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