Bump to xeus 5.2.0 (#266)

Author: anutosh491

CMakeLists.txt

@@ -445,7 +445,6 @@ if(EMSCRIPTEN)
     # TODO: Remove the exported runtime methods
     # after the next xeus release.
     target_link_options(xcpp
-        PUBLIC "SHELL: -s EXPORTED_RUNTIME_METHODS='[\"FS\",\"PATH\",\"LDSO\",\"loadDynamicLibrary\",\"ERRNO_CODES\"]'"
         PUBLIC "SHELL: --preload-file ${SYSROOT_PATH}/include@/include"
         PUBLIC "SHELL: --preload-file ${XEUS_CPP_DATA_DIR}@/share/xeus-cpp"
         PUBLIC "SHELL: --preload-file ${XEUS_CPP_CONF_DIR}@/etc/xeus-cpp"