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.

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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 = "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 #652 (b2d113f) into main (90bf53b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #652   +/-   ##
=======================================
  Coverage   94.97%   94.97%           
=======================================
  Files          51       51           
  Lines        1771     1771           
  Branches      170      170           
=======================================
  Hits         1682     1682           
  Misses         89       89           

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