/usr/share/kconf_update/frameworksintegration-5.16-font.sh is in frameworkintegration 5.18.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/sh
sed -i "s/Oxygen-Sans/Noto Sans/" `kf5-config --path config --locate kdeglobals`
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