chore(deps): update gax.version to v1.49.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.api:gax-bom (source)	minor	1.48.1 -> 1.49.0
com.google.api:gax-grpc (source)	minor	1.48.1 -> 1.49.0

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Release Notes

googleapis/gax-java

v1.49.0

Compare Source

09-30-2019 09:47 PDT

Implementation Changes

• Fix Race condition when shutting down executor/transport channel (#​787)

New Features

• Expose Batcher#sendOutstanding to provide async batch flushing (#​786)

Dependencies

• make opencensus consistent (#​794)
• update google-auth-library to 0.17.2 (#​789)
• Update opencensus, guava, and Truth (#​788)
• Update to Guava 28.1 (#​791)

Internal / Testing Changes

• Update repository_rules.bzl (#​730)

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