Remove unnecessary backports dependency for recent python #577
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Using importlib_metadata conditionally means for the majority of users on recent python, fewer dependencies need be installed, speeding up distro package managers as well as pip install and reducing bandwidth used.
Using sys.version_info checks is self-documenting and various tools can autoremove it when dropping support for old versions of python. This reduces maintenance burden / tech debt when the codebase includes legacy hacks that are anyways slated to be eventually removed.
Fixes: d1d02c6
Fixes: fc7d69c
Bug: #545