[submodule] update libfmt to tag 9.1.0 (#93219)

Pull Request resolved: https://github.com/pytorch/pytorch/pull/93219
Approved by: https://github.com/malfet, https://github.com/Skylion007, https://github.com/albanD

WORKSPACE

@@ -258,6 +258,11 @@ local_repository(
     path = "third_party/fbgemm",
 )
 
+local_repository(
+    name = "unused_ftm_bazel",
+    path = "third_party/fmt/support/bazel",
+)
+
 local_repository(
     name = "unused_kineto_dynolog_googletest",
     path = "third_party/kineto/libkineto/third_party/dynolog/third_party/googletest",

torch/csrc/Exceptions.cpp

@@ -1,11 +1,10 @@
 #include <torch/csrc/Exceptions.h>
 #include <torch/csrc/python_headers.h>
 
+#include <array>
 #include <cstdarg>
 #include <exception>
-#include <sstream>
 #include <utility>
-#include <vector>
 
 #include <fmt/format.h>
 #include <torch/csrc/THP.h>
@@ -281,16 +280,13 @@ PyWarningHandler::~PyWarningHandler() noexcept(false) {
       } else {
         // Lets Python set the source location and puts the C++ warning
         // location into the message.
-        fmt::memory_buffer buf;
+        auto buf = fmt::format(
-        fmt::format_to(
+            "{} (Triggered internally at {}:{}.)",
-            buf,
-            FMT_STRING("{} (Triggered internally at {}:{}.)"),
             msg,
             source_location.file,
             source_location.line);
-        buf.push_back('\0');
         result =
-            PyErr_WarnEx(map_warning_to_python_type(warning), buf.data(), 1);
+            PyErr_WarnEx(map_warning_to_python_type(warning), buf.c_str(), 1);
       }
       if (result < 0) {
         if (in_exception_) {

torch/csrc/distributed/rpc/utils.cpp

@@ -92,7 +92,7 @@ std::string makeRPCError(
   return fmt::format(
       "{}:{}:{}",
       torch::distributed::rpc::kRPCErrorPrefix,
-      errorType,
+      static_cast<int>(errorType),
       rpcErrorStr);
 }