Update git submodules
Update git submodules

* Update plugins/delete-project from branch 'stable-3.0'
  to 542bb8137e356e8ed89856576499d185a9f5c757
  - Correct the description of #deleteArchivedReposAfter
    
    Change-Id: I985c1a55415126e00e231420c36740cd46ca61e2
    
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