vector: compatibility with rust 1.71

pkgs/tools/misc/vector/default.nix

···
     hash = "sha256-+ATOHx+LQLQV4nMdj1FRRvDTqGCTbX9kl290AbY9Vw0=";
   };
 
+  patches = [
+    ./rust-1.71-unnecessary-mut.diff
+  ];
+
   cargoLock = {
     lockFile = ./Cargo.lock;
     outputHashes = {

pkgs/tools/misc/vector/rust-1.71-unnecessary-mut.diff

···
+diff --git a/lib/vector-core/src/tls/incoming.rs b/lib/vector-core/src/tls/incoming.rs
+index 5d2fd1cdb..7992f2c2b 100644
+--- a/lib/vector-core/src/tls/incoming.rs
++++ b/lib/vector-core/src/tls/incoming.rs
+@@ -263,7 +263,7 @@ impl MaybeTlsIncomingStream<TcpStream> {
+     where
+         F: FnOnce(Pin<&mut MaybeTlsStream<TcpStream>>, &mut Context) -> Poll<io::Result<T>>,
+     {
+-        let mut this = self.get_mut();
++        let this = self.get_mut();
+         loop {
+             return match &mut this.state {
+                 StreamState::Accepted(stream) => poll_fn(Pin::new(stream), cx),
+@@ -307,7 +307,7 @@ impl AsyncWrite for MaybeTlsIncomingStream<TcpStream> {
+     }
+ 
+     fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
+-        let mut this = self.get_mut();
++        let this = self.get_mut();
+         match &mut this.state {
+             StreamState::Accepted(stream) => match Pin::new(stream).poll_shutdown(cx) {
+                 Poll::Ready(Ok(())) => {