chore(cargo): bump testdir from 0.8.1 to 0.9.0

Bumps [testdir](https://github.com/flub/testdir) from 0.8.1 to 0.9.0.
- [Changelog](https://github.com/flub/testdir/blob/main/CHANGELOG.md)
- [Commits](https://github.com/flub/testdir/compare/v0.8.1...v0.9.0)

---
updated-dependencies:
- dependency-name: testdir
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.lock

@@ -4736,9 +4736,9 @@ dependencies = [
 
 [[package]]
 name = "testdir"
-version = "0.8.1"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "480060a2e7e1d3c779d3dea588a81c0df78b6a6322b7ce25c0d2ec14a0d5d869"
+checksum = "91fa189a0a10aa81fbf27a34463477d45d691b8c00838ab19e080b54c6947cb4"
 dependencies = [
  "anyhow",
  "backtrace",