Upgrade repo-tools to fix some failing system tests.

[jmdobry]

No description provided.

[codecov]

Codecov Report

Merging #657 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #657   +/-   ##
=======================================
  Coverage   48.52%   48.52%           
=======================================
  Files           1        1           
  Lines          68       68           
=======================================
  Hits           33       33           
  Misses         35       35

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[fhinkel]

Should we use ^2.3.0? I usually do that so I don't have to update all subfolders manually on the next upgrade.

[googlebot]

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[googlebot]

A Googler has manually verified that the CLAs look good.

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