RDFLib / rdflib / 11265267450

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Use pytest in one more test and update contributing guide (#2919)

* Update to current GitHub search

The old URL gave an error "Unrecognised qualifier" because the
extension qualifier is no longer used in the code search query.
The page suggests using `path:*.py` instead, which I've combined
with the existing path into `path:test/**.py`.
More information on the search:
https://docs.github.com/en/search-github/github-code-search/understanding-github-code-search-syntax#path-qualifier

* Help contributors with finding xfail tests

Using the same approach as with the suggestion to replace unittest
with pytest.

* Replace unittest with pytest in another test file

Also simplifying by removing support for Python <2.7.

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