Lintian tag information: upstream-metadata-in-native-source (type: warning)

Description (from lintian-explain-tags)

This source package is Debian-native and has a debian/upstream/metadata
file.

The Upstream MEtadata GAthered with YAml (UMEGAYA) project is an effort to
collect meta-information about upstream projects from any source package.
This file is in YAML format and it is used in to feed the data in the
UltimateDebianDatabase. For example, it can contains the way the authors
want their software be cited in publications and some bibliographic
references about the software.

Please remove the debian/upstream/metadata file.

Please refer to https://dep-team.pages.debian.net/deps/dep12/ and
https://wiki.debian.org/UpstreamMetadata for details.

Visibility: warning
Show-Always: no
Check: debian/upstream/metadata

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