Add support for Python 3.11.

[wRAR]

The problem is similar to https://github.com/scrapy/scrapy/pull/5664 (I think it's the same code).

[codecov[bot]]

Codecov Report

Merging #59 (fe54b54) into master (110ca53) will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
- Coverage   99.60%   99.60%   -0.01%     
==========================================
  Files           4        4              
  Lines         254      252       -2     
==========================================
- Hits          253      251       -2     
  Misses          1        1              

Impacted Files	Coverage Δ
itemloaders/utils.py	96.87% <ø> (-0.19%)	:arrow_down:

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[kmike]

Thanks @wRAR!