Update gatling-charts-highcharts to 3.8.3

[scala-steward]

Updates io.gatling.highcharts:gatling-charts-highcharts from 3.8.2 to 3.8.3.
GitHub Release Notes - Version Diff

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

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Adjust future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "io.gatling.highcharts", artifactId = "gatling-charts-highcharts" } ]

Or, add this to slow down future updates of this dependency:

dependencyOverrides = [{
  pullRequests = { frequency = "@monthly" },
  dependency = { groupId = "io.gatling.highcharts", artifactId = "gatling-charts-highcharts" }
}]

labels: test-library-update, early-semver-patch, semver-spec-patch, commit-count:1