Update mautrix-go (#630)

(adds Matrix media retries)

go.mod

@@ -18,7 +18,7 @@ require (
 	golang.org/x/net v0.11.0
 	google.golang.org/protobuf v1.31.0
 	maunium.net/go/maulogger/v2 v2.4.1
-	maunium.net/go/mautrix v0.15.4-0.20230628151140-e99578a15474
+	maunium.net/go/mautrix v0.15.4-0.20230707135424-4639f0c9c471
 )
 
 require (

go.sum

@@ -131,5 +131,5 @@ maunium.net/go/mauflag v1.0.0 h1:YiaRc0tEI3toYtJMRIfjP+jklH45uDHtT80nUamyD4M=
 maunium.net/go/mauflag v1.0.0/go.mod h1:nLivPOpTpHnpzEh8jEdSL9UqO9+/KBJFmNRlwKfkPeA=
 maunium.net/go/maulogger/v2 v2.4.1 h1:N7zSdd0mZkB2m2JtFUsiGTQQAdP0YeFWT7YMc80yAL8=
 maunium.net/go/maulogger/v2 v2.4.1/go.mod h1:omPuYwYBILeVQobz8uO3XC8DIRuEb5rXYlQSuqrbCho=
-maunium.net/go/mautrix v0.15.4-0.20230628151140-e99578a15474 h1:Pzopg6NL7qaNdG2iUf8dVnu9+tVEa82b44KJKmpb/NY=
-maunium.net/go/mautrix v0.15.4-0.20230628151140-e99578a15474/go.mod h1:zLrQqdxJlLkurRCozTc9CL6FySkgZlO/kpCYxBILSLE=
+maunium.net/go/mautrix v0.15.4-0.20230707135424-4639f0c9c471 h1:jo8zt1l3QZOzclEyf/9ZK06Eqcf/aoBoMXEEp5B4S/E=
+maunium.net/go/mautrix v0.15.4-0.20230707135424-4639f0c9c471/go.mod h1:zLrQqdxJlLkurRCozTc9CL6FySkgZlO/kpCYxBILSLE=