Pin yara-python to 4.3.1 in Poetry

[ryanohoro]

Describe the change

This change prevents poetry from upgrading the externally managed yara-python

Describe testing procedures

Successful build with up-to-date lock file

poetry lock --no-update
docker-compose -f build/docker-compose.yaml build

Sample output

N/A

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of and tested my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings

[phutelmyer]

@ryanohoro Do we need to modify the Dockerfile to remove the yara-python install reference?

[ryanohoro]

@phutelmyer No, this change just tells Poetry that the dependency is already satisfied when other modules request it. It does not replace the externally managed yara-python.