proto: fix compatibility with older quinn

Author: Ralith

quinn-proto/src/connection/mod.rs

@@ -1240,6 +1240,13 @@ impl Connection {
         self.update_keys(None, false);
     }
 
+    // Compatibility wrapper for quinn < 0.11.7. Remove for 0.12.
+    #[doc(hidden)]
+    #[deprecated]
+    pub fn initiate_key_update(&mut self) {
+        self.force_key_update();
+    }
+
     /// Get a session reference
     pub fn crypto_session(&self) -> &dyn crypto::Session {
         &*self.crypto