[client-python] Remove support of python 3.9 (#14072)

[xfournet]

Proposed changes

• Remove client-python ci build on 3.9 version

Related issues

• Fix [client-python] Remove support of python 3.9 #14072

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.36%. Comparing base (a48bfc4) to head (f456a66).

Additional details and impacted files

@@               Coverage Diff                @@
##           release/current   #14073   +/-   ##
================================================
  Coverage            32.36%   32.36%           
================================================
  Files                 3096     3096           
  Lines               210893   210893           
  Branches             38194    38195    +1     
================================================
+ Hits                 68254    68257    +3     
+ Misses              142639   142636    -3     

Flag	Coverage Δ
opencti-client-python	45.50% <ø> (ø)
opencti-front	2.83% <ø> (ø)
opencti-graphql	67.73% <ø> (+<0.01%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.