*.log
files contain reporter output. There are separate files for every supported Node.js version.
To update a specific set of files you can run:
UPDATE_REPORTER_LOG=1 npx tap -j3 test-tap/reporters/{default,tap}.js
You'll need to run this for each supported (major) Node.js version. Use your favorite Node.js version manager, such as nvm or nodenv.
Make sure to commit any new files, and of course changed ones.