bpo-38820: OpenSSL 3.0.0: Use supported hashing algos in doc test (GH-25319)

ripemd160 is not available in OpenSSL 3.0.0's default crypto provider.
It's only present in legacy provider.

Signed-off-by: Christian Heimes <christian@python.org>
(cherry picked from commit 2d7fdc9)

Co-authored-by: Christian Heimes <christian@python.org>

Author: miss-islington

Diff for: Doc/library/hashlib.rst

@@ -109,10 +109,10 @@ More condensed:
 
 Using :func:`new` with an algorithm provided by OpenSSL:
 
-   >>> h = hashlib.new('ripemd160')
+   >>> h = hashlib.new('sha512_256')
    >>> h.update(b"Nobody inspects the spammish repetition")
    >>> h.hexdigest()
-   'cc4a5ce1b3df48aec5d22d1f16b894a0b894eccc'
+   '19197dc4d03829df858011c6c87600f994a858103bbc19005f20987aa19a97e2'
 
 Hashlib provides the following constant attributes: