If on Python 3.9+, set usedforsecurity parameter to False

[PabloAlexis611]

This is a small, backwards compatible change that allows the use of rinohtype in FIPS-enabled environments that raise errors when using the MD5 hashlib function. Since the purpose of using MD5 in this context is not security-related, this change is acceptable. The usedforsecurity parameter was added starting in Python 3.9+ for the md5 function of the hashlib library.

An error like the following is otherwise thrown:

digital envelope routines:EVP_DigestInit_ex:disabled for fips

An alternative could also be to call the SHA256 hashing function instead, but making this change keeps the current behavior of the rinohtype package.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.23%. Comparing base (26635ef) to head (ce17498).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #426   +/-   ##
=======================================
  Coverage   77.23%   77.23%           
=======================================
  Files          93       93           
  Lines       14690    14690           
  Branches     2416     2416           
=======================================
  Hits        11346    11346           
  Misses       2906     2906           
  Partials      438      438           

Flag	Coverage Δ
3.10	77.24% <100.00%> (ø)
3.11	77.25% <100.00%> (ø)
3.12.0-alpha	77.25% <100.00%> (ø)
3.8	77.20% <100.00%> (ø)
3.9	46.88% <50.00%> (ø)
Linux	77.22% <100.00%> (ø)
pypy-3.9	77.23% <100.00%> (ø)
regression-3.10	75.75% <100.00%> (ø)
regression-3.11	75.76% <100.00%> (ø)
regression-3.12	75.76% <100.00%> (ø)
regression-3.8	75.70% <100.00%> (ø)
regression-pypy3	75.74% <100.00%> (ø)
unit-3.10	46.89% <50.00%> (ø)
unit-3.11	46.89% <50.00%> (ø)
unit-3.12	46.89% <50.00%> (ø)
unit-3.8	46.88% <50.00%> (ø)
unit-3.9	46.88% <50.00%> (ø)
unit-pypy3	46.90% <50.00%> (ø)

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[brechtm]

Thanks @PabloAlexis611!