Backport: exclude buggy current setuptools release

[hexagonrecursion]

setuptools>45 was added in 0e9befb.
This constrint was never backported to 1.1.
My backport honors that.

This is a backport of #6223

Original commit message:

see there: pypa/setuptools#3063

[codecov-commenter]

Codecov Report

Merging #6226 (b2bbdb1) into 1.1-maint (65a19ce) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           1.1-maint    #6226      +/-   ##
=============================================
- Coverage      79.80%   79.79%   -0.01%     
=============================================
  Files             27       27              
  Lines          10492    10492              
  Branches        2148     2148              
=============================================
- Hits            8373     8372       -1     
- Misses          1594     1597       +3     
+ Partials         525      523       -2     

Impacted Files	Coverage Δ
src/borg/archiver.py	81.09% <0.00%> (-0.34%)	⬇️
src/borg/repository.py	85.30% <0.00%> (-0.20%)	⬇️
src/borg/cache.py	85.46% <0.00%> (+0.12%)	⬆️
src/borg/archive.py	81.83% <0.00%> (+0.51%)	⬆️

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