Bump pact_matching dependency version (#32)

Unintentionally broke the build with my rebase, as `pact_matching_ffi`
currently locks the `pact_matching` version number, and it had changed
upstream. In the future, the Pact project may prefer to leave off the
version number, but for us it makes things more predictable.

Author: alilleybrinker

rust/Cargo.lock

@@ -12,7 +12,7 @@ exclude = [
 ]
 
 [dependencies]
-pact_matching = { version = "0.6.4", path = "../pact_matching" }
+pact_matching = { version = "0.7.1", path = "../pact_matching" }
 anyhow = "1.0.28"
 libc = "0.2.69"
 zeroize = "1.1.0"