fix: downgrade IndexOutOfBounds to a warning

[TomAFrench]

Description

Problem*

Resolves #5464

Summary*

This test was failing due to the error being found at compile-time and so a compile-time error was returned rather than the expected runtime error. I've then downgraded this error into a warning so that circuit execution can be performed so that the expected error is thrown.

Additional Context

Documentation*

Check one:

• No documentation needed.
• Documentation included in this PR.
• [For Experimental Features] Documentation to be submitted in a separate PR.

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.