Update libloading requirement from 0.7 to 0.8

Updates the requirements on [libloading](https://github.com/nagisa/rust_libloading) to permit the latest version.
- [Release notes](https://github.com/nagisa/rust_libloading/releases)
- [Commits](nagisa/rust_libloading@0.7.0...0.8.0)

---
updated-dependencies:
- dependency-name: libloading
  dependency-type: direct:production
...

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

Cargo.toml

@@ -14,7 +14,7 @@ byteorder = "1"
 chomp = { package = "chomp1", version = "0.3" }
 hex = "0.4"
 libc = "0.2"
-libloading = { version = "0.7", optional = true }
+libloading = { version = "0.8", optional = true }
 rand = "0.8"
 thiserror = "1"