File fix-quic-mutability.patch of Package trusttunnel

diff --git a/lib/src/quic_multiplexer.rs b/lib/src/quic_multiplexer.rs
index 72a857a..e0174d9 100644
--- a/lib/src/quic_multiplexer.rs
+++ b/lib/src/quic_multiplexer.rs
@@ -904,7 +904,7 @@ impl QuicSocket {
                 match self.process_pending_h3_events()? {
                     None => {
                         let writable_streams: Vec<_> = {
-                            let quic_conn = self.quic_conn.lock().unwrap();
+                            let mut quic_conn = self.quic_conn.lock().unwrap();
                             let mut waiting_streams = self.waiting_writable_streams.lock().unwrap();
                             let writable_streams: Vec<_> = waiting_streams
                                 .iter()