Pin cmake_build_extension==0.5.1

[dweindl]

Missed one location before.

Closes #2442.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.64%. Comparing base (0c00046) to head (06bbe8f).

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #2446       +/-   ##
============================================
+ Coverage         0   77.64%   +77.64%     
============================================
  Files            0      324      +324     
  Lines            0    20928    +20928     
  Branches         0     1464     +1464     
============================================
+ Hits             0    16249    +16249     
- Misses           0     4676     +4676     
- Partials         0        3        +3     

Flag	Coverage Δ
cpp	73.42% <ø> (?)
cpp_python	34.09% <ø> (?)
petab	36.65% <ø> (?)
python	72.18% <ø> (?)

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see 324 files with indirect coverage changes