tests_extractor.d: Upgrade libdparse

[dkorpel]

Unblocking dlang/dmd#16315 hopefully

[dlang-bot]

Thanks for your pull request and interest in making D better, @dkorpel! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
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Testing this PR locally

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dub run digger -- build "master + tools#471"