Updated stringtie version and test data

[SaimMomin12]

FOR CONTRIBUTOR:

• I have read the CONTRIBUTING.md document and this tool is appropriate for the tools-iuc repo.
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Fixes: #6004

[nsoranzo]

Can you please change the tests to allow 4 lines of diff instead of updating all output files, e.g.:

<output name="output_gtf" file="stringtie_out10.gtf" ftype="gtf" lines_diff="4"/>

Thanks!

[SaimMomin12]

Thanks for the suggestion, I will incorporate it and update the pull request. Thanks!

[nsoranzo]

Thanks @SaimMomin12 !