cmake: Prevent nested tarballs (or other archives) in the release

This happened dring the release of the version 2.5.2.

holidays: Update holidays using newest holidata.net data

Remove outdated holiday files that could not be updated.

Task Release 2.5.1

Task Release 2.5.0

Task Release 2.4.4

Task Release 2.4.3

Task Release 2.4.2

Task Release 2.4.1

Task Release 2.4.0

Task Release 2.3.0