Add 'md5-sha1' to hashlib_weak_hash and hmac_digest_weak

[ericwb]

Is your feature request related to a problem? Please describe.
md5-sha1 is another outdated weak algorithm that may appear as available in hashlib.

Describe the solution you'd like
Add md5-sha1 to hashlib_weak_hash and hmac_digest_weak rules.

Describe alternatives you've considered
n/a

Additional context

>>> hashlib.algorithms_available
{'md5', 'sm3', 'shake_128', 'blake2s', 'sha3_224', 'sha512_224', 'sha512', 'sha3_512', 'sha256', 'md5-sha1', 'sha1', 'sha224', 'sha384', 'blake2b', 'sha512_256', 'shake_256', 'ripemd160', 'sha3_384', 'sha3_256'}

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[ericwb]

Note, it seems you can use md5-sha1 as a function:

>>> hashlib.md5-sha1
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'sha1' is not defined

Only works if passed to hashlib.new("md5-sha1")