Add missing noexcept on cython function

[djhoese]

Removes warnings from cython during building

• Closes #xxxx
• Tests added
• Tests passed
• Passes git diff origin/main **/*py | flake8 --diff
• Fully documented

[codecov]

Codecov Report

Merging #60 (57f4ae3) into main (2944321) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #60   +/-   ##
=======================================
  Coverage   88.07%   88.07%           
=======================================
  Files          21       21           
  Lines        1434     1434           
=======================================
  Hits         1263     1263           
  Misses        171      171           

Flag	Coverage Δ
unittests	88.07% <ø> (ø)

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Files	Coverage Δ
geotiepoints/_simple_modis_interpolator.pyx	100.00% <ø> (ø)

[coveralls]

coverage: 87.219%. first build when pulling 57f4ae3 on djhoese:bugfix-cython-perf-warnings into 2944321 on pytroll:main.