update pybind11, 2.4.3->2.6.0 (#50068)

cmake/external/pybind11.cmake

@@ -16,7 +16,7 @@ include(ExternalProject)
 
 set(PYBIND_PREFIX_DIR ${THIRD_PARTY_PATH}/pybind)
 set(PYBIND_REPOSITORY ${GIT_URL}/pybind/pybind11.git)
-set(PYBIND_TAG v2.4.3)
+set(PYBIND_TAG v2.6.0)
 
 set(PYBIND_INCLUDE_DIR ${THIRD_PARTY_PATH}/pybind/src/extern_pybind/include)
 include_directories(${PYBIND_INCLUDE_DIR})

python/paddle/fluid/dygraph/varbase_patch_methods.py

@@ -1079,7 +1079,7 @@ def monkey_patch_varbase():
         # NOTE(zhiqiu): pybind11 will set a default __str__ method of enum class.
         # So, we need to overwrite it to a more readable one.
         # See details in https://github.com/pybind/pybind11/issues/2537.
-        origin = getattr(core.VarDesc.VarType, "__repr__")
+        origin = getattr(core.VarDesc.VarType, "__str__")
 
         def dtype_str(dtype):
             if dtype in _PADDLE_DTYPE_2_NUMPY_DTYPE:
@@ -1092,7 +1092,7 @@ def monkey_patch_varbase():
                 # for example, paddle.fluid.core.VarDesc.VarType.LOD_TENSOR
                 return origin(dtype)
 
-        setattr(core.VarDesc.VarType, "__repr__", dtype_str)
+        setattr(core.VarDesc.VarType, "__str__", dtype_str)
         _already_patch_repr = True
 
     # patch math methods for varbase