fix(stellar): upgrade stellar-sdk v10 → @stellar/stellar-sdk v16 #3773

Job	Run time
Generate merge base API spec	7m 44s
Generate head API spec	8m 28s
Check specs identical	3s
Check breaking changes	0s
API Spec Check	5s
Generate vacuum reports for API spec	0s
Linter Override	0s
	16m 20s

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