Support static version in pyproject.toml

[blink1073]

Useful for flit backends with static version.

[codecov-commenter]

Codecov Report

Merging #275 (328d563) into main (b056c1e) will decrease coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
- Coverage   85.16%   84.98%   -0.19%     
==========================================
  Files          19       19              
  Lines        2387     2358      -29     
  Branches      305      299       -6     
==========================================
- Hits         2033     2004      -29     
- Misses        255      256       +1     
+ Partials       99       98       -1     

Impacted Files	Coverage Δ
jupyter_releaser/tests/util.py	99.24% <ø> (-0.01%)	⬇️
jupyter_releaser/tee.py	82.92% <100.00%> (ø)
jupyter_releaser/tests/test_functions.py	98.81% <100.00%> (+0.02%)	⬆️
jupyter_releaser/util.py	75.11% <100.00%> (+0.69%)	⬆️
jupyter_releaser/cli.py	90.83% <0.00%> (-0.65%)	⬇️
jupyter_releaser/tests/conftest.py	98.42% <0.00%> (-0.15%)	⬇️
jupyter_releaser/tests/test_cli.py	99.04% <0.00%> (-0.01%)	⬇️

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