Update wabt requirement from 0.7 to 0.8

Updates the requirements on [wabt](https://github.com/pepyakin/wabt-rs) to permit the latest version.
- [Release notes](https://github.com/pepyakin/wabt-rs/releases)
- [Commits](https://github.com/pepyakin/wabt-rs/commits)

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

Cargo.toml

@@ -40,7 +40,7 @@ faerie = "0.10.1"
 target-lexicon = { version = "0.4.0", default-features = false }
 pretty_env_logger = "0.3.0"
 file-per-thread-logger = "0.1.1"
-wabt = "0.7"
+wabt = "0.8"
 libc = "0.2.50"
 errno = "0.2.4"