Explicit dependency type for grpc

[gunrus]

Faced problem during configuration of jmeter-maven-plugin, it's can not collect grpc dependency because default type is 'jar' not 'pom'

[codecov-io]

Codecov Report

Merging #53 into master will decrease coverage by 0.24%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master     #53      +/-   ##
===========================================
- Coverage     72.85%   72.6%   -0.25%     
+ Complexity      348     345       -3     
===========================================
  Files            38      38              
  Lines          1610    1610              
  Branches         51      51              
===========================================
- Hits           1173    1169       -4     
- Misses          355     358       +3     
- Partials         82      83       +1

Impacted Files	Coverage Δ	Complexity Δ
...oha/java/detail/TransactionStatusObserverFace.java	18.18% <0%> (-9.1%)	2% <0%> (-1%)
...roha/java/debug/TestTransactionStatusObserver.java	50% <0%> (-5.56%)	15% <0%> (-2%)

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