chore(deps): update rust crate testdir to 0.9.1

This MR contains the following updates:

Package	Type	Update	Change
testdir	dev-dependencies	minor	0.8.0 -> 0.9.1

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Release Notes

flub/testdir (testdir)

v0.9.1

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• Fix windows support up a bit. Previously it would not detect the correct cargo parent process and thus cycle through numbered directories too fast. Also allow not finding the test name since doc tests on windows do not work.

v0.9.0

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• Support for cargo-nextest.

v0.8.1

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• When cleaning up old numbered directories if the entry is not found this error is ignored. This is possible if multiple cleanups are racing each other.

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