fix the copyright date checker

Now that we changed year, it is obvious that it does not work.
7 jobs for develop in 38 minutes and 45 seconds (queued for 1 second)
Status Job ID Name Coverage
  Dist
passed #643902
dist

00:25:16

 
  Check
passed #643903
check

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passed #643905
deb

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passed #643906
generate

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passed #643904
mingw

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  Manual
passed #643907
pages

00:02:35

 
  Deploy
passed pages:deploy

00:00:04