Update git submodules
Update git submodules

* Update plugins/delete-project from branch 'master'
  to 3481845462f86959ff4ae4efb726e2bc3e494c3d
  - Add override to comply with new noImplicitOverride ts compiler option
    
    Google-Bug-Id: b/201385514
    Change-Id: I0b40385e0a4b1a9f67349dd0d674cb9202edd84c
    
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