Bump pytest and its plugins.

[gmmajal]

Relevant issue: #73

Background info: # any relevant background info for additional context, references to documentations etc.

• There are deprecation warnings being raised for unit tests running on python v3.12.
• In order to remove these warnings pytest and its plugins: pytest-cov and pytest-mock need to be upgraded to versions which are compatible with python v3.12.

Changes introduced: # list changes to the code repo made in this pull request

• Four packages have been bumped: pytest, pytest-cov, pytest-mock and safety.
• The pyproject.toml and poetry.lock files have been changed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (b083b55) to head (31a066b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #74   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           16        16           
  Lines          922       922           
=========================================
  Hits           922       922           

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[annakasprzik]

Checked all checks for all Python versions (test code, security) and found no issues left.