Fix type hint for search functions (backport #1132)

[mergify[bot]]

Closes #1130

This is an automatic backport of pull request #1132 done by Mergify.

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[coveralls]

Pull Request Test Coverage Report for Build 8147177497

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.01%) to 96.568%

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Files with Coverage Reduction	New Missed Lines	%
rustworkx-core/src/generators/random_graph.rs	2	79.43%
<!--	Total:	2		-->

Totals
Change from base Build 8010392350:	-0.01%
Covered Lines:	16740
Relevant Lines:	17335

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💛 - Coveralls