deps: remove grpc test dep since it's now in shared-deps

[stephaniewang526]

grpc-iam-v1 added in shared-deps v0.6.0

[codecov]

Codecov Report

Merging #220 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #220   +/-   ##
=========================================
  Coverage     79.05%   79.05%           
  Complexity      312      312           
=========================================
  Files            21       21           
  Lines          2841     2841           
  Branches        153      153           
=========================================
  Hits           2246     2246           
  Misses          533      533           
  Partials         62       62           

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[anguillanneuf]

Approve because all tests are passing.

What was grpc-google-aim-v1 used for?

[stephaniewang526]

It is used for testing.