Copyright for haskell-executable-path source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: executable-path
Upstream-Contact: Balazs Komuves 
Source: https://hackage.haskell.org/package/executable-path

Files: *
Copyright: Balazs Komuves 
License: public-domain

Files: debian/*
Copyright: held by the contributors mentioned in debian/changelog
License: public-domain

License: public-domain
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