Update git submodules
Update git submodules

* Update plugins/plugin-manager from branch 'master'
  to 9e7b0a086b3e4d56a3a9407d21b6648c650b8809
  - Fix RedundantOverride error flagged by error prone
    
    Running recent error prone version complaining on that code:
    
    XAuthFilter.java:81: error: [RedundantOverride] This overriding method
    is redundant, and can be removed.
        public PrintWriter getWriter() throws IOException {
                           ^
        (see https://errorprone.info/bugpattern/RedundantOverride)
      Did you mean to remove this line?
    
    Bug: Issue 12677
    Change-Id: Ia0712501bb0aafed669f1d713ca9bbb57c81d236
    
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