Require pre-commit; fix lint issues; update dependencies

[castrapel]

This PR does the following:

• Upgrades dependencies (A recently upgrade of urllib3 appears to cause issues with Poetry on M1 Mac. Upgrading dependencies resolves it),
• Fixes lint issues found from running pre-commit run -a
• Runs pre-commit run -a before the unit tests t

[castrapel]

This is a duplicate of the function below

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04 🎉

Comparison is base (e03f4e6) 85.29% compared to head (e1382cf) 85.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #409      +/-   ##
==========================================
+ Coverage   85.29%   85.33%   +0.04%     
==========================================
  Files          98       98              
  Lines       10696    10698       +2     
==========================================
+ Hits         9123     9129       +6     
+ Misses       1573     1569       -4     

Flag	Coverage Δ
functional_tests	67.19% <50.00%> (+0.39%)	⬆️
functional_tests_config_discovery	47.05% <50.00%> (+<0.01%)	⬆️
unit_tests	75.37% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
iambic/plugins/v0_1_0/aws/template_generation.py	100.00% <100.00%> (ø)
iambic/vendor/lambda_multiprocessing/__init__.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[castrapel]

Merged into Will's branch bug/en-2119-fix-merge-model-int-handling