ci: cancel test jobs with a timeout after running for four minutes

[zimeg]

Summary

This PR changes the test timeout time from "10" minutes to "4" minutes to avoid hanging after failed tests in some cases - related to #2138 #2159.

Notes

Most successful tests tend to finish in ~2 minutes, with 1/200 of the last successful runs taking 4:08 which seems to've been a flake...

IMO this doesn't fix the related issues, but it makes rerunning the tests faster in the meantime 😅

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.94%. Comparing base (a0e79f9) to head (727f57f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2175   +/-   ##
=======================================
  Coverage   91.94%   91.94%           
=======================================
  Files          38       38           
  Lines       10328    10328           
  Branches      652      652           
=======================================
  Hits         9496     9496           
  Misses        820      820           
  Partials       12       12           

Flag	Coverage Δ
cli-hooks	95.23% <ø> (ø)
cli-test	94.76% <ø> (ø)
oauth	77.39% <ø> (ø)
socket-mode	61.82% <ø> (ø)
web-api	96.88% <ø> (ø)
webhook	96.65% <ø> (ø)

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[zimeg]

@WilliamBergamin 🚀 ✨