[client-python] chore(deps): update codecov/codecov-action action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
codecov/codecov-action	action	major	v5 → v6

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Release Notes

codecov/codecov-action (codecov/codecov-action)

v6

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.41%. Comparing base (58abf4c) to head (e73bc70).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #204   +/-   ##
=======================================
  Coverage   70.41%   70.41%           
=======================================
  Files          58       58           
  Lines        2329     2329           
=======================================
  Hits         1640     1640           
  Misses        689      689           

Flag	Coverage Δ
connectors	70.41% <ø> (ø)

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[guzmud]

Won't merge for now, unsure about the compatibility status. Explanations below:

• the test-and-print-coverage runs on ubuntu:latest which is Ubuntu 26.04 (Resolute Racoon)
• the codecov-action v6 upgrades some internals, asking for node24 compatibility (cf. their changelog https://github.com/codecov/codecov-action/releases/tag/v6.0.0)
• node24 is not yet available on Ubuntu 26.04 (cf. https://launchpad.net/ubuntu/+source/nodejs)

[renovate]

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