/usr/lib/libreoffice/program/services/pyuno.rdb is in python3-uno 1:6.0.3-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | <?xml version="1.0"?>
<components xmlns="http://openoffice.org/2010/uno-components"><component loader="com.sun.star.loader.SharedLibrary" environment="gcc3" prefix="pythonloader" uri="vnd.sun.star.expand:$LO_LIB_DIR/libpythonloaderlo.so"><implementation name="org.openoffice.comp.pyuno.Loader"><service name="com.sun.star.loader.Python"/></implementation></component></components>
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