/usr/share/lintian/overrides/postbooks-updater is in postbooks-updater 2.3.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # the menu icon is supplied by a dependency, libxtuplecommon
postbooks-updater binary: menu-icon-missing
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