deps: update dependency com.google.api:gax-bom to v1.57.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.api:gax-bom	minor	1.56.0 -> 1.57.0

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Release Notes

googleapis/gax-java

v1.57.0

Compare Source

06-10-2020 15:01 PDT

Implementation Changes

• logging: catch and log exceptions in Watchdog runnable to ensure it never stops running (#​1036)
• android: make GaxProperties.version accessible in Android (#​1117)
• Make watchdog @BetaApi and watchdog provider implementations @InternalApi (#​1119)

New Features

• generalize ExecutorService for transport layers (#​1098)
• add setAttemptDirectPath(boolean) for InstantiatingGrpcChannelProvider.Builder (#​1015)

Dependencies

• update grpc to 1.30.0, protobuf to 3.12.2 (#​1125)
• update api-common-java to 1.92 (#​1126)

Internal / Testing Changes

• [gax-java] chore: include only external-facing gax testing utils in testlibJar (#​1120)
• ci: Linkage Checker to examine linkage error at artifact level (#​1032)
• ci: Adopt GitHub Actions in gax-java: unit tests and linkage monitor (#​1062)
• chore: display call settings configuration through toString (#​1017)
• test: cleaning up deprecated usages (#​858)

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[codecov]

Codecov Report

Merging #236 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #236   +/-   ##
=========================================
  Coverage     67.62%   67.62%           
  Complexity      384      384           
=========================================
  Files            36       36           
  Lines          1986     1986           
  Branches        269      269           
=========================================
  Hits           1343     1343           
  Misses          535      535           
  Partials        108      108           

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