build(deps): bump libtest-mimic from 0.7.3 to 0.8.1 (solana-labs#7329)

Bumps [libtest-mimic](https://github.com/LukasKalbertodt/libtest-mimic) from 0.7.3 to 0.8.1.
- [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
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Cargo.lock

@@ -49,7 +49,7 @@ tokio = "1.40"
 [dev-dependencies]
 solana-test-validator = "2.0.3"
 assert_cmd = "2.0.16"
-libtest-mimic = "0.7"
+libtest-mimic = "0.8"
 serial_test = "3.1.1"
 tempfile = "3.13.0"