Update promptflow exceptions reference

[emmanuel-ferdman]

Description

Commit e301780992c5628b0c38b9b0d77963b95027732e moved the location of the exceptions.py. This PR adjusts sources to changes.

All Promptflow Contribution checklist:

• [x] The pull request does not introduce [breaking changes].
• [ ] CHANGELOG is updated for new features, bug fixes or other significant changes.
• [x] I have read the contribution guidelines.
• [ ] I confirm that all new dependencies are compatible with the MIT license.
• [ ] Create an issue and link to the pull request to get dedicated review from promptflow team. Learn more: suggested workflow.

General Guidelines and Best Practices

• [x] Title of the pull request is clear and informative.
• [ ] There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• [ ] Pull request includes test coverage for the included changes.

[github-actions[bot]]

Hi, thank you for your interest in helping to improve the prompt flow experience and for your contribution. We've noticed that there hasn't been recent engagement on this pull request. If this is still an active work stream, please let us know by pushing some changes or leaving a comment.

[github-actions[bot]]

Hi, thank you for your contribution. Since there has not been recent engagement, we are going to close this out. Feel free to reopen if you'd like to continue working on these changes. Please be sure to remove the no-recent-activity label; otherwise, this is likely to be closed again with the next cleanup pass.

[emmanuel-ferdman]

@nagkumar91 @luigiw @ninghu can you please reopen this PR and review it? The PR is ready