deps: update core dependencies to v1.27.2

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
io.grpc:grpc-netty-shaded	patch	1.27.1 -> 1.27.2
io.grpc:grpc-api	patch	1.27.1 -> 1.27.2
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 #71 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #71      +/-   ##
============================================
- Coverage     77.79%   77.75%   -0.04%     
+ Complexity     1722     1721       -1     
============================================
  Files            60       60              
  Lines          5836     5836              
  Branches        769      769              
============================================
- Hits           4540     4538       -2     
- Misses          922      923       +1     
- Partials        374      375       +1

Impacted Files	Coverage Δ	Complexity Δ
...oogle/cloud/spanner/jdbc/SingleUseTransaction.java	86% <0%> (-1%)	36% <0%> (-1%)

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