GH-41398: [R][CI] Windows job failing after R 4.4 release (#41409)

### Rationale for this change

We can't throw warnings on cran.

### What changes are included in this PR?

Update function to match changes in libarrow added in GH-39864

### Are these changes tested?

CI
### Are there any user-facing changes?

No

* GitHub Issue: #41398

Authored-by: Jacob Wujciak-Jens <jacob@wujciak.de>
Signed-off-by: Jacob Wujciak-Jens <jacob@wujciak.de>

r/src/extension-impl.cpp

@@ -87,7 +87,9 @@ arrow::Result<std::shared_ptr<arrow::DataType>> RExtensionType::Deserialize(
  return std::shared_ptr<RExtensionType>(cloned.release());
 }
 
-std::string RExtensionType::ToString() const {
+std::string RExtensionType::ToString() const { return ToString(false); }
+
+std::string RExtensionType::ToString(bool show_metadata) const {
  arrow::Result<std::string> result = SafeCallIntoR<std::string>([&]() {
  cpp11::environment instance = r6_instance();
  cpp11::function instance_ToString(instance["ToString"]);
@@ -98,7 +100,11 @@ std::string RExtensionType::ToString() const {
  // In the event of an error (e.g., we are not on the main thread
  // and we are not inside RunWithCapturedR()), just call the default method
  if (!result.ok()) {
+#if ARROW_VERSION_MAJOR >= 16
+ return ExtensionType::ToString(show_metadata);
+#else
  return ExtensionType::ToString();
+#endif
  } else {
  return result.ValueUnsafe();
  }

r/src/extension.h

@@ -52,6 +52,8 @@ class RExtensionType : public arrow::ExtensionType {
 
  std::string Serialize() const { return extension_metadata_; }
 
+ std::string ToString(bool show_metadata = false) const;
+ // wrapper for libarrow < 16
  std::string ToString() const;
 
  cpp11::sexp Convert(const std::shared_ptr<arrow::ChunkedArray>& array) const;