fix: warn on scripts with invalid shebangs

[henryiii]

• fix: missing lib is warning, not error
• fix: warn if scripts included with potentially invalid shebangs

See #130.

[codecov]

Codecov Report

Merging #132 (9a19719) into main (8b0aae7) will decrease coverage by 0.14%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##             main     #132      +/-   ##
==========================================
- Coverage   90.60%   90.46%   -0.15%     
==========================================
  Files          43       43              
  Lines        1724     1730       +6     
==========================================
+ Hits         1562     1565       +3     
- Misses        162      165       +3     

Impacted Files	Coverage Δ
src/scikit_build_core/build/wheel.py	91.22% <66.66%> (-1.37%)	⬇️
src/scikit_build_core/builder/sysconfig.py	82.05% <100.00%> (ø)
src/scikit_build_core/_logging.py	78.94% <0.00%> (-1.76%)	⬇️

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