Update with_foundry

[critesjosh]

Description

Updates the with_foundry example to use 0.31.0

Problem*

Resolves

Summary*

Additional Context

PR Checklist*

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

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[critesjosh]

I still need to update testing workflow to use bb to generate the verifier contract