Update the github workflow files

[gmmajal]

Relevant issue: #55

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

• Newer versions of several github actions are available. We should upgrade them.
• We should restrict the permission of job tokens and specify permissions on a job level.

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

• codecov, setup-python, checkout, docker/login, docker/metadata and docker/build-push are all github actions whose versions have been updated in the .github/workflows folder.
• The permissions keyword has been added on a job level to restrict the access granted to tokens.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (221dd00) to head (27f9644).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #56   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines          905       905           
=========================================
  Hits           905       905           

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