Update a few dependencies (#40)

Unable to update rustls for now (`actix-web` depends on a too old version of `rustls`)

Reviewed-on: #40

src/tcp_relay_server/tls_cert_client_verifier.rs

@@ -55,7 +55,7 @@ impl CustomCertClientVerifier {
             let parsed_crl = pem::parse(crl_file)
                 .map_err(|e| encpasulate_error(e, "Failed to decode CRL file!"))?;
 
-            Some(parsed_crl.contents)
+            Some(parsed_crl.into_contents())
         } else {
             None
         };