deps: update dependency io.grpc:grpc-bom to v1.27.2

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
io.grpc:grpc-bom	patch	1.27.1 -> 1.27.2

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Release Notes

grpc/grpc-java

v1.27.2

Compare Source

Bug Fixes

• grpclb: grpclb can handle empty address from LoadBalancer instead of throwing exception

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[codecov]

Codecov Report

Merging #55 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #55   +/-   ##
=========================================
  Coverage     59.72%   59.72%           
  Complexity      378      378           
=========================================
  Files            46       46           
  Lines          2262     2262           
  Branches        247      247           
=========================================
  Hits           1351     1351           
  Misses          804      804           
  Partials        107      107

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