Lintian tag: priority-extra-is-replaced-by-priority-optional

Type: warning

Description (from lintian-explain-tags)

Since Debian Policy version 4.0.1, the priority extra has been deprecated.

Please update debian/control and replace all instances of Priority: extra
with Priority: optional.

Please refer to Priorities (Section 2.5) in the Debian Policy Manual for
details.

Visibility: warning
Show-Always: no
Check: fields/priority

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