/usr/share/lintian/overrides/python-brotli is in python-brotli 0.3.0+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # False positive
python-brotli: hardening-no-fortify-functions usr/lib/python2.7/dist-packages/brotli.x86_64-linux-gnu.so
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