Increase max iters for integ test

[khurram-ghani]

Related issue(s)/PRs: None

Summary

Very simple PR to increase max-iterations for the intermittently failing slow integration test.

Fully backwards compatible: yes

PR checklist

• [X] The quality checks are all passing
• [ ] The bug case / new feature is covered by tests
• [ ] Any new features are well-documented (in docstrings or notebooks)