2260 fix mypy issues

[cakekoa]

What does this PR do?

Fixes #2260.

Fixes a number of mypy issues.

PR Checklist

• [x] Have you added an explanation of what your changes do and why you'd like to include them?
• [ ] Is the TravisCI build passing?
• [ ] ~~Was the CHANGELOG.md updated to reflect the changes?~~
• [ ] ~~Was the documentation framework updated to reflect the changes?~~
• [ ] ~~Have you checked that you haven't introduced any duplicate code?~~

Testing Checklist

• [ ] ~~Added relevant unit tests?~~

• [ ] Have you successfully tested your changes locally? Elaborate:

  Tested by running the unit tests

• [x] If applicable, add screenshots or log transcripts of the feature working Prior to these changes:

  Found 165 errors in 70 files (checked 586 source files)

  After these changes:

  Found 126 errors in 47 files (checked 586 source files)

[codecov[bot]]

Codecov Report

Base: 59.85% // Head: 60.23% // Increases project coverage by +0.37% :tada:

Coverage data is based on head (4226d90) compared to base (dfa1709). Patch coverage: 77.61% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2330      +/-   ##
===========================================
+ Coverage    59.85%   60.23%   +0.37%     
===========================================
  Files          537      538       +1     
  Lines        13898    14011     +113     
===========================================
+ Hits          8319     8439     +120     
+ Misses        5579     5572       -7     

Impacted Files	Coverage Δ
monkey/infection_monkey/monkey.py	0.00% <ø> (ø)
monkey/monkey_island/cc/server_setup.py	0.00% <0.00%> (ø)
...rvices/telemetry/zero_trust_checks/segmentation.py	55.31% <0.00%> (-1.21%)	:arrow_down:
...y/monkey_island/cc/setup/mongo/mongo_db_process.py	35.13% <0.00%> (ø)
...es/zero_trust/zero_trust_report/finding_service.py	62.50% <20.00%> (-3.29%)	:arrow_down:
...land/cc/services/attack/technique_reports/T1065.py	76.19% <50.00%> (+3.46%)	:arrow_up:
monkey/infection_monkey/post_breach/pba.py	56.09% <75.00%> (ø)
monkey/common/credentials/encoding.py	100.00% <100.00%> (ø)
.../aggregating_propagation_credentials_repository.py	95.91% <100.00%> (ø)
monkey/infection_monkey/exploit/HostExploiter.py	79.71% <100.00%> (+0.29%)	:arrow_up:
... and 34 more

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