Copyright for golang-github-alexflint-go-filemutex source package in Jammy

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Source: https://github.com/alexflint/go-filemutex
Upstream-Name: go-filemutex

Files:
 *
Copyright:
    2010-2017 Alex Flint
    2013      The Go Authors
License: Expat and BSD-3-Clause~Google

Files:
 debian/*
Copyright:
 2019 Dmitry Smirnov 
License: Expat

License: Expat
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License: BSD-3-Clause~Google
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