Bump sentry-sidekiq from 5.11.0 to 5.12.0 #309

Job	Run time
Lint Ruby / Run RuboCop	25s
Lint JavaScript / Run Standardx	22s
Lint SCSS / Run Stylelint	25s
Security Analysis / Run Brakeman	17s
Test Ruby / Run RSpec	1m 57s
	3m 26s

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