Update sbt-header to 5.9.0

[scala-steward]

Updates de.heikoseeberger:sbt-header from 5.8.0 to 5.9.0.
GitHub Release Notes - Version Diff

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

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention me in the comments below.

Configure Scala Steward for your repository with a .scala-steward.conf file.

Have a fantastic day writing Scala!

Adjust future updates

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

updates.ignore = [ { groupId = "de.heikoseeberger", artifactId = "sbt-header" } ]

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

dependencyOverrides = [{
  pullRequests = { frequency = "@monthly" },
  dependency = { groupId = "de.heikoseeberger", artifactId = "sbt-header" }
}]

labels: sbt-plugin-update, early-semver-minor, semver-spec-minor, commit-count:1

[codecov]

Codecov Report

Merging #261 (9b0ab0b) into master (36e7e61) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #261   +/-   ##
=======================================
  Coverage   89.50%   89.50%           
=======================================
  Files          34       34           
  Lines         629      629           
  Branches       88       88           
=======================================
  Hits          563      563           
  Misses         66       66