Add hatchling handling

[blink1073]

Fixes issue seen in jupyter/notebook#6448 where releaser tries to use python setup.py --version to get the file, when it should be using hatchling.version.

[codecov-commenter]

Codecov Report

Merging #329 (d7ed316) into main (5038e71) will increase coverage by 0.03%.
The diff coverage is 63.63%.

@@            Coverage Diff             @@
##             main     #329      +/-   ##
==========================================
+ Coverage   83.86%   83.89%   +0.03%     
==========================================
  Files          19       19              
  Lines        2559     2570      +11     
  Branches      337      341       +4     
==========================================
+ Hits         2146     2156      +10     
+ Misses        296      295       -1     
- Partials      117      119       +2     

Impacted Files	Coverage Δ
jupyter_releaser/util.py	69.56% <42.85%> (-0.04%)	⬇️
jupyter_releaser/tests/test_functions.py	99.07% <100.00%> (+0.03%)	⬆️

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