Resturcture ABCs import from collections module

[blackbird7112]

📝 Description

Type: 🪲 bugfix

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Change import of ABCs from 'collections' to 'collections.abc' because the old import will fail in future versions of python.

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Resolves #1903

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🚦 Testing

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[codecov]

Codecov Report

Merging #2106 (35aea57) into master (6269996) will not change coverage.
The diff coverage is 50.00%.

❗ Current head 35aea57 differs from pull request most recent head 667dc6e. Consider uploading reports for the commit 667dc6e to get more accurate results

@@           Coverage Diff           @@
##           master    #2106   +/-   ##
=======================================
  Coverage   58.13%   58.13%           
=======================================
  Files          75       75           
  Lines        8602     8602           
=======================================
  Hits         5001     5001           
  Misses       3601     3601           

Impacted Files	Coverage Δ
tardis/io/util.py	77.98% <50.00%> (ø)

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