fix typings + drop python 3.8 + pin deps for securit vulnerability fixes

[fmigneault]

• closes [Snyk] Security upgrade setuptools from 40.5.0 to 70.0.0 #65
• closes [Snyk] Security upgrade setuptools from 68.0.0 to 70.0.0 #66

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.

Project coverage is 87.73%. Comparing base (193a52b) to head (63bab54).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
cowbird/monitoring/monitor.py	88.88%	0 Missing and 2 partials ⚠️
cowbird/utils.py	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
- Coverage   87.76%   87.73%   -0.04%     
==========================================
  Files          40       40              
  Lines        3245     3252       +7     
  Branches      480      481       +1     
==========================================
+ Hits         2848     2853       +5     
- Misses        276      277       +1     
- Partials      121      122       +1     

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