Fix FFTW compilation bug

[ChrisZYJ]

Description

Set minimum policy version to 3.5 to fix FFTW compilation with CMake 4.0+.

See FFTW/fftw3#381

Type of change

• Bug fix (non-breaking change which fixes an issue)

Note

It still fails the tests where it needs to build the master branch. The log shows that FFTW in the PR branch is correctly built.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.66%. Comparing base (700267d) to head (05d0abc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #810   +/-   ##
=======================================
  Coverage   43.66%   43.66%           
=======================================
  Files          65       65           
  Lines       19159    19159           
  Branches     2338     2338           
=======================================
  Hits         8365     8365           
  Misses       9370     9370           
  Partials     1424     1424           

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