Update pytest version to 7.2.0

[marcofavorito]

Proposed changes

This will also solve a security issue detected by dependabot:

https://github.com/AI-Planning/pddl/security/dependabot/3

Moreover, the versions of the pytest plugins have been pinned to current versions.

Fixes

n/a

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

Put an x in the boxes that apply.

• I have read the CONTRIBUTING doc
• I am making a pull request against the develop branch (left side). Also you should start your branch off our develop.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works

Further comments

n/a