[issue15752] change test_json's use of deprecated unittest function

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3a02a1f7d069 by Ezio Melotti in branch '3.2':
#15752: s/assertRaisesRegexp/assertRaisesRegex/g
http://hg.python.org/cpython/rev/3a02a1f7d069

New changeset b36ce0a3a844 by Ezio Melotti in branch 'default':
#15752: merge with 3.2.
http://hg.python.org/cpython/rev/b36ce0a3a844

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nosy: +python-dev

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