Removed DeprecationWaning of NumPy

[PaulJonasJost]

Warning for example here:

test/sample/test_sample.py: 159569 warnings
  /home/runner/work/pyPESTO/pyPESTO/test/sample/test_sample.py:21: DeprecationWarning: Conversion of an array with ndim > 0 to a scalar is deprecated, and will error in future. Ensure you extract a single element from your array before performing this operation. (Deprecated NumPy 1.25.)
    return float(norm.logpdf(x))

As noticeable, it is a warning occurring approx 160.000 times.

[codecov-commenter]

Codecov Report

Merging #1158 (55b71e4) into develop (160c2a8) will decrease coverage by 3.79%.
Report is 404 commits behind head on develop.
The diff coverage is 87.95%.

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@@             Coverage Diff             @@
##           develop    #1158      +/-   ##
===========================================
- Coverage    88.16%   84.38%   -3.79%     
===========================================
  Files           79      148      +69     
  Lines         5257    11649    +6392     
===========================================
+ Hits          4635     9830    +5195     
- Misses         622     1819    +1197     

Files	Coverage Δ
pypesto/C.py	100.00% <100.00%> (ø)
pypesto/__init__.py	100.00% <100.00%> (ø)
pypesto/engine/__init__.py	100.00% <100.00%> (ø)
pypesto/engine/multi_process.py	93.10% <100.00%> (+0.79%)	⬆️
pypesto/engine/multi_thread.py	100.00% <100.00%> (ø)
pypesto/engine/single_core.py	100.00% <100.00%> (ø)
pypesto/engine/task.py	100.00% <100.00%> (ø)
pypesto/ensemble/__init__.py	100.00% <100.00%> (ø)
pypesto/ensemble/task.py	100.00% <100.00%> (ø)
pypesto/hierarchical/__init__.py	100.00% <100.00%> (ø)
... and 138 more