chore: third-party libs upgrades

[viniarck]

This is a reminder regarding core related deps both from runtime requirements/run.txt or testing requirements/dev.txt that need to be upgraded (because of general maintainability or dependabot alerts that @jab1982 has reported recently too):

• pytest
• requests and it's transitive library like certifi / idna
• ipython

I'll specify which specific version later on (I'll analyze the changelogs when I get back to this task)

Before this upgrade though, it's highly recommended that issue #338 is addressed too to simplify the effort for our team whenever kytosd pinned transitive deps are updated.

[viniarck]

pytest was done, and requirements/dev.txt got simplified as requrirements/dev.in. requests and ipython will be addressed in the future.