/usr/share/perl5/ is in libplack-app-proxy-perl 0.29-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Plack/
/usr/share/perl5/Plack/App/
/usr/share/perl5/Plack/App/Proxy/
/usr/share/perl5/Plack/App/Proxy/Test.pm
/usr/share/perl5/Plack/App/Proxy/Backend.pm
/usr/share/perl5/Plack/App/Proxy/Backend/
/usr/share/perl5/Plack/App/Proxy/Backend/AnyEvent/
/usr/share/perl5/Plack/App/Proxy/Backend/AnyEvent/HTTP.pm
/usr/share/perl5/Plack/App/Proxy/Backend/LWP.pm
/usr/share/perl5/Plack/App/Proxy.pm
/usr/share/perl5/Plack/Middleware/
/usr/share/perl5/Plack/Middleware/Proxy/
/usr/share/perl5/Plack/Middleware/Proxy/RewriteLocation.pm
/usr/share/perl5/Plack/Middleware/Proxy/AddVia.pm
/usr/share/perl5/Plack/Middleware/Proxy/Connect.pm
/usr/share/perl5/Plack/Middleware/Proxy/LoadBalancer.pm