regex upgrade required for dspy

[RobFirth]

Description

(ragbench-py3.12) ➜  rag_bench git:(17-run-a-dspy-demo-using-bedrock-lm) ✗ poetry add git+https://github.com/stanfordnlp/dspy.git#main
Warning: Setting `installer.modern-installation` to `false` is deprecated.
The pip-based installer will be removed in a future release.
See https://github.com/python-poetry/poetry/issues/8987.

Updating dependencies
Resolving dependencies... (0.0s)

Because ragbench depends on dspy (2.0.8) @ git+https://github.com/stanfordnlp/dspy.git@main which depends on regex (^2023.10.3), regex is required.
So, because ragbench depends on regex (^2022.1.18), version solving failed.

Suggested Fix

Update regex dependency to be very permissive