deps: update dependency com.google.auth:google-auth-library-bom to v0.20.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.auth:google-auth-library-bom	minor	0.19.0 -> 0.20.0

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Release Notes

googleapis/google-auth-library-java

v0.20.0

Compare Source

Features

• updated JwtClaims.Builder methods to public (#​396) (9e5de14)

Dependencies

• update guava to 28.2-android (#​389) (70bd8ff)

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[codecov]

Codecov Report

Merging #135 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #135      +/-   ##
============================================
- Coverage     66.48%   66.43%   -0.06%     
+ Complexity      370      365       -5     
============================================
  Files            34       34              
  Lines          1877     1877              
  Branches        240      240              
============================================
- Hits           1248     1247       -1     
- Misses          527      528       +1     
  Partials        102      102

Impacted Files	Coverage Δ	Complexity Δ
.../com/google/cloud/MonitoredResourceDescriptor.java	82.35% <0%> (-1.69%)	20% <0%> (-4%)
...a/com/google/cloud/testing/BaseEmulatorHelper.java	30.85% <0%> (-0.58%)	5% <0%> (ø)
...src/main/java/com/google/cloud/ServiceOptions.java	43.87% <0%> (-0.4%)	32% <0%> (-1%)
.../java/com/google/cloud/testing/CommandWrapper.java	96.96% <0%> (+9.09%)	13% <0%> (ø)	⬇️

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