Copyright for hnswlib source package in Bullseye

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

Files: *
Copyright: Yury Malkov
           D. A. Yanushin
           with contributions by
           Apoorv Sharma [@apoorv-sharma](https://github.com/apoorv-sharma)
           Dmitry [@2ooom](https://github.com/2ooom)
           Louis Abraham ([@louisabraham](https://github.com/louisabraham))
License: Apache-2.0

Files: sift_1b.cpp
Copyright: David Robert Nadeau
Comment: The code is available at http://NadeauSoftware.com/
License: CC-BY-3.0

Files: debian/*
Copyright: 2020 Steffen Moeller 
License: Apache-2.0

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