CSHLD-886: Fix incorrect hashbytes padding in sBTC withdraw builder #2799

Job	Run time
Generate head API spec	8m 21s
Generate merge base API spec	8m 30s
Check specs identical	3s
Check breaking changes	0s
API Spec Check	4s
Linter Override	0s
Generate vacuum reports for API spec	-1s
	16m 57s

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