Refactor path handling to use pathlib in generate_model_info.py

[AntonPetrov]

This pull request updates the generate_model_info.py file to replace the use of the os module with pathlib for path manipulations. The changes include:

• Replaced os.path.join with the / operator from pathlib for constructing paths.
• Used Path.glob for pattern matching instead of glob.glob.
• Updated file opening methods to use Path.open() instead of the built-in open() function.

These changes improve the readability and maintainability of the code by utilizing the more modern pathlib library for path operations.

---

This pull request was co-created with Cosine Genie

Original Task: R2DT/vyy62m895ohk
Author: Anton Petrov

[github-actions]

Docker image tag(s) pushed:

rnacentral/r2dt:pr-191

Labels added to images:

org.opencontainers.image.created=2025-05-01T18:07:15.580Z
org.opencontainers.image.description=Visualise RNA secondary structure in consistent, reproducible and recognisable layouts
org.opencontainers.image.licenses=Apache-2.0
org.opencontainers.image.revision=e1856ba6b6bf9676e4781e4d5122a918b9ba2f54
org.opencontainers.image.source=https://github.com/r2dt-bio/R2DT
org.opencontainers.image.title=R2DT
org.opencontainers.image.url=https://github.com/r2dt-bio/R2DT
org.opencontainers.image.version=pr-191