deps: update dependency com.google.api:gax-bom to v1.53.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.api:gax-bom	minor	1.52.0 -> 1.53.0

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Release Notes

googleapis/gax-java

v1.53.0

Compare Source

01-09-2020 10:51 PST

New Features

• feat: enhancement for Batcher api to address bulk read (#​833)
• feat: implemented watchdog as BackgroundResource (#​838)
• Create a executorService with a separate pool of threads for channelpool (#​836)

Bug Fixes

• fix: allows retries when setting maxAttempts without setting TotalTimeout (#​835)

Implementation Changes

• bazel: Replace native maven_jar rule with jvm_maven_import_external (#​837)
• cleanup(batcher): removing the non-applicable TODOs comments (#​834)

Dependencies

• Update dependency org.easymock:easymock to v4.1 (#​821)
• Update dependency com.google.auto.value:auto-value to v1.7 (#​806)

Internal / Testing Changes

• Bump next snapshot (#​840)

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Coverage ? 66.43% Complexity ? 365 =========================================
Files ? 34 Lines ? 1877 Branches ? 240 =========================================
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