chore(deps): update libtest-mimic requirement

Updates the requirements on [libtest-mimic](https://github.com/LukasKalbertodt/libtest-mimic) to permit the latest version.
- [Release notes](https://github.com/LukasKalbertodt/libtest-mimic/releases)
- [Changelog](https://github.com/LukasKalbertodt/libtest-mimic/blob/master/CHANGELOG.md)
- [Commits](LukasKalbertodt/libtest-mimic@v0.7.3...v0.8.1)

---
updated-dependencies:
- dependency-name: libtest-mimic
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

integrations/object_store/Cargo.toml

@@ -56,7 +56,7 @@ opendal = { version = "0.51.2", path = "../../core", features = [
 rand = "0.8.5"
 tokio = { version = "1", features = ["fs", "macros", "rt-multi-thread"] }
 anyhow = "1.0.86"
-libtest-mimic = "0.7.3"
+libtest-mimic = "0.8.1"
 uuid = "1.11.0"
 datafusion = "44.0.0"
 url = "2.5.2"