Lintian tag information: latest-debian-changelog-entry-without-new-date (type: error)

Description (from lintian-explain-tags)

The latest Debian changelog entry has either the same or even an older
date as the entry before.

This can result in subtle bugs due to the SOURCE_DATE_EPOCH environment
variable being the same between the older and newer versions.

Visibility: error
Show-Always: no
Check: debian/changelog

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