Update git submodules
Update git submodules

* Update plugins/replication from branch 'stable-2.13'
  - ReplicationMetrics: Make members private final
    
    These members should only be accessed through the public methods:
    
     - start(...), to create/start a new timer context
     - record(...), to record the retry/delay values
    
    Mark the members as private final to prevent unintended access.
    
    Change-Id: I69a7e3b13ba4c344f3176528306163ebef07653c
    
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