[3.14] gh-142195: Fixed Popen.communicate indefinite loops (GH-143203) (#143255)

gh-142195: Fixed Popen.communicate indefinite loops (GH-143203)

Changed condition to evaluate if timeout is less than or equals to 0. This is needed for simulated time environments such as Shadow where the time will match exactly on the boundary.

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(cherry picked from commit fa9a4254e81c0abcc3345021c45aaf5f788f9ea9)

Co-authored-by: Prithviraj Chaudhuri <p.chaudhuri1993@gmail.com>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>