A paragraph in debian/tests/control mentions an obsolete value for the Restrictions field. Though still allowed, this will become unsupported in the future and the whole paragraph will be ignored.
For more information please consult:
The tag is present in Lintian version
That is the most recent version we know about.
We use semantic versions.
The patch number is a commit step indicator relative to the
release tag in our Git
You can find the detection logic for this version at commit a1e47cb. For merge requests, please use the latest version in the Lintian check testsuite.