Use tempfile.mkstemp instead of tempfile.NamedTemporaryFile for windows compatibility

[chrispyles]

See #723 (comment)

FYI @ctnelson1997 this fix will be included in v5.1.4

[codecov]

Codecov Report

Patch coverage: 87.50% and project coverage change: -0.01% ⚠️

Comparison is base (4e3a882) 80.71% compared to head (f2fb1fd) 80.71%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #732      +/-   ##
==========================================
- Coverage   80.71%   80.71%   -0.01%     
==========================================
  Files          63       63              
  Lines        4206     4215       +9     
==========================================
+ Hits         3395     3402       +7     
- Misses        811      813       +2     

Files Changed	Coverage Δ
otter/execute/preprocessor.py	86.08% <ø> (ø)
otter/execute/logging.py	93.22% <66.66%> (-3.08%)	⬇️
otter/execute/__init__.py	98.18% <92.85%> (+0.18%)	⬆️
otter/check/logs.py	82.53% <100.00%> (-0.10%)	⬇️
otter/run/run_autograder/__init__.py	85.48% <100.00%> (ø)
otter/test_files/__init__.py	76.21% <100.00%> (-0.15%)	⬇️
otter/utils.py	79.66% <100.00%> (+0.11%)	⬆️

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