Fix checking for deprecation warnings to use assertWarns()
(backport #14145)
#14146
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Summary
Fix the deprecation warning check to use the correct
assertWarns()
method rather thanassertRaises()
that is used to test for exceptions. This fixes the test suite when it is run without-Werror
.Details and comments
Since this is merely a change in tests, I don't think it needs a changelog entry.
This is an automatic backport of pull request #14145 done by Mergify.