fix build: looks like a `rivestd` got left behind by a merge (#11953) 5069323843

Co-authored-by: Josh Jersild <joshua@rive.app>

.rive_head

diff --git a/.rive_head b/.rive_head
index 284ed49..8db37f9 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-c17d93023831409c010af31a2cf67114e5110a55
+50693238434ae0c53c40146dc0902591de343e25

src/file.cpp

diff --git a/src/file.cpp b/src/file.cpp
index 7ac8e1b..b1bf59f 100644
--- a/src/file.cpp
+++ b/src/file.cpp
@@ -466,7 +466,7 @@
                 break;
             case ListenerInputTypeKeyboardBase::typeKey:
                 stackObject =
-                    rivestd::make_unique<ListenerInputTypeKeyboardImporter>(
+                    std::make_unique<ListenerInputTypeKeyboardImporter>(
                         object->as<ListenerInputTypeKeyboard>());
                 stackType = ListenerInputTypeKeyboardBase::typeKey;
                 break;