bpo-39424: Fix the call method.

[damani42]

The method assertRaisesRegexp is deprecated use assertRaisesRegex
instead.

https://bugs.python.org/issue39424

[the-knights-who-say-ni]

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[4383]

LGTM

[vstinner]

@serhiy-storchaka: This change has been merged whereas the CLA was not signed. But it's a trivial change, so I don't think that it matters. Moreover, I'm in touch with @damani42 who told me that he is going to sign the CLA (right me, he didn't get the confirmation email of the creation of his bugs.python.org account).

[serhiy-storchaka]

Yes, I merged it because it was trivial. If not @damani42 somebody other would provide an identical PR in a few days.