bug: Exceptions raised in third-party modules get the wrong line reference

[edgarrmondragon]

Consider the following test

def test_annotation_third_party_exception(testdir):
    testdir.makepyfile(
        my_module="""
        def fn():
            raise Exception('oops')
        """
    )

    testdir.makepyfile(
        f"""
        import pytest
        from my_module import fn
        pytest_plugins = 'pytest_github_actions_annotate_failures'

        def test_fail():
            fn()
        """
    )
    testdir.monkeypatch.setenv("GITHUB_ACTIONS", "true")
    result = testdir.runpytest_subprocess()
    result.stderr.fnmatch_lines(
        ["::error file=test_annotation_third_party_exception.py,line=6::test_fail*oops*",]
    )

Running this results in the following incorrect output

::error file=test_annotation_third_party_exception.py,line=2::test_fail%0A%0AException: oops

Note that the above points to line 2, but that's in the my_module file, not in the test file. The correct line number should be 6.

I have a fix for this based on the traceback chain, so I can submit a PR.