Remove unneeded call to private scipy function in SAR reader

[mraspaud]

This PR removes an unneeded call (!) from a private (!) scipy function in the SAR reader. Said function has moreover been removed from newer scipy, making the experimental ci jobs crash.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.10%. Comparing base (28a793c) to head (a0a7f53).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2968      +/-   ##
==========================================
+ Coverage   96.08%   96.10%   +0.01%     
==========================================
  Files         377      377              
  Lines       55134    55134              
==========================================
+ Hits        52976    52984       +8     
+ Misses       2158     2150       -8     

Flag	Coverage Δ
behaviourtests	3.94% <0.00%> (ø)
unittests	96.19% <100.00%> (+0.01%)	⬆️

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[coveralls]

Pull Request Test Coverage Report for Build 11680219286

Details

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 96.206%

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Totals
Change from base Build 11678446960:	0.01%
Covered Lines:	53228
Relevant Lines:	55327

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💛 - Coveralls