Bug#1127764: python3-numcodecs: deprecation warning from merely importing numcodecs

[Clint Adams]

Package: python3-numcodecs
Version: 0.16.0+ds-1

% python3 <<EOF                   
heredoc> import numcodecs
heredoc> EOF
/usr/lib/python3/dist-packages/numcodecs/__init__.py:106: DeprecationWarning: crc32c usage is deprecated since numcodecs v0.16.4. It is recommended to install google_crc32c instead.
  from numcodecs.checksum32 import CRC32, Adler32, JenkinsLookup3