[BEAM-8346] Increase timeout of beam_PostRelease_Python_Candidate to …

…6hours

Fix timeout failure like https://builds.apache.org/job/beam_PostRelease_Python_Candidate/167/. See details in https://issues.apache.org/jira/browse/BEAM-8346.

+R: @yifanzou

.test-infra/jenkins/job_ReleaseCandidate_Python.groovy

@@ -22,7 +22,7 @@ job('beam_PostRelease_Python_Candidate') {
  description('Runs verification of the Python release candidate.')
 
  // Set common parameters.
- commonJobProperties.setTopLevelMainJobProperties(delegate)
+ commonJobProperties.setTopLevelMainJobProperties(delegate, 'master', 360)
 
  // Allows triggering this build against pull requests.
  commonJobProperties.enablePhraseTriggeringFromPullRequest(