Skip tasks with missing dependencies.

[tobiasraabe]

Closes #104.

[codecov]

Codecov Report

Merging #116 (66ff4a1) into main (8e7686e) will decrease coverage by 0.00%.
The diff coverage is 92.30%.

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
- Coverage   93.30%   93.29%   -0.01%     
==========================================
  Files          63       63              
  Lines        5269     5293      +24     
==========================================
+ Hits         4916     4938      +22     
- Misses        353      355       +2     

Flag	Coverage Δ
end_to_end	79.99% <92.30%> (+0.05%)	⬆️
integration	41.62% <23.07%> (-0.10%)	⬇️
unit	67.23% <65.38%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
src/_pytask/resolve_dependencies.py	98.82% <88.88%> (-1.18%)	⬇️
tests/test_skipping.py	100.00% <100.00%> (ø)

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