Use verify spawner in all cases in verify path

src/main.rs

@@ -315,7 +315,7 @@ async fn do_server_main(
                     .wrap(config.digest_middleware().spawner(verify_spawner.clone()))
                     .wrap(VerifySignature::new(
                         MyVerify(
-                            requests,
+                            requests.spawner(verify_spawner.clone()),
                             actors.clone(),
                             state.clone(),
                             verify_spawner.clone(),

src/requests.rs

@@ -208,6 +208,11 @@ impl Requests {
         }
     }
 
+    pub(crate) fn spawner(mut self, spawner: Spawner) -> Self {
+        self.config = self.config.spawner(spawner);
+        self
+    }
+
     pub(crate) fn reset_breaker(&self, iri: &IriString) {
         self.breakers.succeed(iri);
     }