bump pybind11 version to VG/v2.11

Author: evaleev

python/CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.12)
 FetchContent_Declare(
   pybind11
   GIT_REPOSITORY      https://github.com/ValeevGroup/pybind11.git
-  GIT_TAG             80d452484c5409444b0ec19383faa84bb7a4d351 # v2.4.3
+  GIT_TAG             ValeevGroup/v2.11
   )
 FetchContent_MakeAvailable(pybind11)
 
@@ -39,19 +39,19 @@ if (BUILD_TESTING)
 
   # check for presence of prerequisite modules
   foreach(_mod pytest numpy)
-    execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "import ${_mod}"
+    execute_process(COMMAND ${Python_EXECUTABLE} -c "import ${_mod}"
         OUTPUT_QUIET ERROR_QUIET
         RESULTS_VARIABLE check_for_${_mod})
     if (check_for_${_mod})
-      message(FATAL_ERROR "Python module \"${_mod}\" is not installed; install via \"${PYTHON_EXECUTABLE} -m pip install ${_mod}\" and rerun cmake")
+      message(FATAL_ERROR "Python module \"${_mod}\" is not installed; install via \"${Python_EXECUTABLE} -m pip install ${_mod}\" and rerun cmake")
     endif(check_for_${_mod})
   endforeach(_mod)
 
   # test step
   add_test(
     NAME tiledarray/unit/python/run
     # need to use pytest to find tiledarray module properly
-    COMMAND ${PYTHON_EXECUTABLE} -m pytest ${PROJECT_SOURCE_DIR}/test_tiledarray.py -v
+    COMMAND ${Python_EXECUTABLE} -m pytest ${PROJECT_SOURCE_DIR}/test_tiledarray.py -v
     WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
   )
   set_tests_properties(tiledarray/unit/python/run