Update sbt-header to 5.1.0

[scala-steward]

Updates de.heikoseeberger:sbt-header from 5.0.0 to 5.1.0.

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 @scala-steward in the comments below.

Have a nice day!

[codecov]

Codecov Report

Merging #288 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #288   +/-   ##
=======================================
  Coverage   49.36%   49.36%           
=======================================
  Files          54       54           
  Lines         628      628           
  Branches       27       27           
=======================================
  Hits          310      310           
  Misses        318      318

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