fix: drop duplicate translate_exception declaration

Assisted-by: ClaudeCode:claude-fable-5

include/pybind11/detail/internals.h

diff --git a/include/pybind11/detail/internals.h b/include/pybind11/detail/internals.h
index b304274..3d48c5f 100644
--- a/include/pybind11/detail/internals.h
+++ b/include/pybind11/detail/internals.h
@@ -527,7 +527,7 @@
 
 bool raise_err(PyObject *exc_type, const char *msg);
 
-void translate_exception(std::exception_ptr p);
+// translate_exception is forward-declared near the top of this header
 
 #if !defined(__GLIBCXX__)
 void translate_local_exception(std::exception_ptr p);