/usr/lib/ocaml/bz2/META is in libbz2-ocaml-dev 0.6.0-6+b3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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version = "0.6.0" archive(byte) = "bz2.cma" archive(native) = "bz2.cmxa"