Update public.ecr.aws/rapidfort/backend-exe Docker tag to v1.1.43

This MR contains the following updates:

Package	Type	Update	Change
public.ecr.aws/rapidfort/backend-exe	ironbank-docker	patch	1.1.41-1-rfhardened -> 1.1.43-1-rfhardened
public.ecr.aws/rapidfort/backend-exe	stage	patch	1.1.41-1-rfhardened -> 1.1.43-1-rfhardened

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