deps: update dependency com.google.api:gax-bom to v1.55.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.api:gax-bom	minor	1.54.0 -> 1.55.0

---

Release Notes

googleapis/gax-java

v1.55.0

Compare Source

03-27-2020 08:33 PDT

New Features

• Allow client authors to create their own callable chains (#​891)

Dependencies

• Update org.threeten:threetenbp to v1.4.1 (#​890)

Internal / Testing Changes

• chore(deps): update dependency com.google.api.grpc:grpc-google-cloud-bigtable-v2 to v1 (#​953)
• chore(deps): update dependency com.google.api.grpc:grpc-google-cloud-pubsub-v1 to v1 (#​970)
• remove unused property (#​887)

---

Renovate configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻️ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by WhiteSource Renovate. View repository job log here.

[codecov]

Codecov Report

Merging #83 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #83   +/-   ##
=========================================
  Coverage     59.25%   59.25%           
  Complexity      378      378           
=========================================
  Files            46       46           
  Lines          2280     2280           
  Branches        250      250           
=========================================
  Hits           1351     1351           
  Misses          822      822           
  Partials        107      107

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 89300ec...0c4cb02. Read the comment docs.