Fix Yahoo Data Provider unit test (backport #309)

[mergify[bot]]

This is an automatic backport of pull request #309 done by Mergify.

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[coveralls]

Pull Request Test Coverage Report for Build 6925375290

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 75.822%

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Files with Coverage Reduction	New Missed Lines	%
qiskit_finance/data_providers/wikipedia_data_provider.py	4	66.0%
<!--	Total:	4		-->

Totals
Change from base Build 6861697856:	-0.1%
Covered Lines:	646
Relevant Lines:	852

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💛 - Coveralls