pybind11: update to 2.11.1

This supports newer Python versions.

Author: mathstuf

CMake/fletch-tarballs.cmake

@@ -562,7 +562,7 @@ list(APPEND fletch_external_sources Darknet)
 # pybind11
 if (fletch_ENABLE_pybind11 OR fletch_ENABLE_ALL_PACKAGES)
   set(pybind11_SELECT_VERSION 2.5.0 CACHE STRING "Select the version of pybind11 to build.")
-  set_property(CACHE pybind11_SELECT_VERSION PROPERTY STRINGS "2.5.0" "2.10.3")
+  set_property(CACHE pybind11_SELECT_VERSION PROPERTY STRINGS "2.5.0" "2.10.3" "2.11.1")
 endif()
 
 set(pybind11_version ${pybind11_SELECT_VERSION})
@@ -571,6 +571,8 @@ if (pybind11_version VERSION_EQUAL 2.5.0)
   set(pybind11_md5 "1ad2c611378fb440e8550a7eb6b31b89" )
 elseif (pybind11_version VERSION_EQUAL 2.10.3)
   set(pybind11_md5 "a093dac9dfd613a5a7c2afa50a301098" )
+elseif (pybind11_version VERSION_EQUAL 2.11.1)
+  set(pybind11_md5 "49e92f92244021912a56935918c927d0" )
 elseif(pybind11_version)
   message(ERROR "pybind11 Version ${pybind11_version} Not Supported")
 endif()