[ANCHOR-525] SEP-6: Fix `NotifyAmountsUpdatedHandler` #58

Job	Run time
codeql_analysis / CodeQL Analysis (java-kotlin)	6m 43s
gradle_build / Gradle Build and Unit Tests	4m 26s
essential_tests / Run Essential Tests (Integration Tests, Faster End-2-End Tests, Unit Tests, and Stellar Validatio...	6m 23s
jacoco_report / Generate Jacoco Coverage Report	20s
extended_tests / Run Extended Tests	8m 21s
complete	1s
	26m 14s

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