Update dependency @google-cloud/pubsub to v2.3.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@google-cloud/pubsub	dependencies	minor	2.2.0 -> 2.3.0

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Release Notes

googleapis/nodejs-pubsub

v2.3.0

Compare Source

Features

• Add support for server-side flow control (#​1041) (a53f6c7)
• support for detaching subscriptions (#​1032) (c5af3a9)

Bug Fixes

• typeo in nodejs .gitattribute (#​1049) (b4c6dc0)

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[codecov]

Codecov Report

Merging #554 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #554   +/-   ##
=======================================
  Coverage   80.29%   80.29%           
=======================================
  Files          22       22           
  Lines        3750     3750           
=======================================
  Hits         3011     3011           
  Misses        739      739           

Flag	Coverage Δ
#aux	73.80% <ø> (ø)
#base	75.28% <ø> (-0.06%)	⬇️
#dhcp	72.07% <ø> (-0.03%)	⬇️
#many	72.02% <ø> (-0.06%)	⬇️
#modules	23.57% <ø> (ø)
#topo	72.21% <ø> (-0.06%)	⬇️

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