all: prep for release v0.19.0

[vangent]

No description provided.

[codecov]

Codecov Report

Merging #2740 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #2740      +/-   ##
=========================================
+ Coverage   68.29%   68.3%   +<.01%     
=========================================
  Files         115     115              
  Lines       13282   13282              
=========================================
+ Hits         9071    9072       +1     
+ Misses       3551    3548       -3     
- Partials      660     662       +2

Impacted Files	Coverage Δ
internal/retry/retry.go	88.23% <0%> (-11.77%)	⬇️
pubsub/pubsub.go	91.87% <0%> (-1.57%)	⬇️
server/health/sqlhealth/sqlhealth.go	80.95% <0%> (+19.04%)	⬆️

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