Move update_dependency.sh to g3/d/r/tools
Move update_dependency.sh to g3/d/r/tools

We don't need this script to be publicly visible.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=231606840

google/nomulus,google/nomulus,google/nomulus,google/nomulus,google/nomulus,google/nomulus