importlib_metadata remove deprecated entry point interfaces

[woutdenolf]

Closes #7783

See python/importlib_metadata#405

[codecov]

Codecov Report

Base: 89.60% // Head: 89.59% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (f77e98a) compared to base (88a0316).
Patch coverage: 57.14% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7785      +/-   ##
==========================================
- Coverage   89.60%   89.59%   -0.01%     
==========================================
  Files         128      128              
  Lines       15871    15877       +6     
  Branches     2116     2117       +1     
==========================================
+ Hits        14221    14225       +4     
- Misses       1421     1423       +2     
  Partials      229      229              

Flag	Coverage Δ
unittests	89.57% <42.85%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
celery/utils/imports.py	88.29% <57.14%> (-1.48%)	⬇️

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[woutdenolf]

Either this or #7782

[auvipy]

with a new kombu release, the doc build is still failing, on python 3.7 first as per the doc build

[woutdenolf]

The doc build installs kombu-5.2.4 not kombu-5.3.0b2

Collecting kombu<6.0,>=5.2.3
  Downloading kombu-5.2.4-py3-none-any.whl (189 kB)