/usr/share/lintian/overrides/libpam-modules-bin is in libpam-modules-bin 1.1.3-7ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # yes, we know it's sgid, that's the whole point...
libpam-modules-bin: setgid-binary sbin/unix_chkpwd 2755 root/shadow
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