Merge branch 'bugfix/fix_encrypted_project_flash_arg_file_gen' into 'master'

CMake: fix encrypted project flash arg file generation

See merge request espressif/esp-idf!5741

components/esptool_py/flash_encrypted_project_args.in

@@ -1,3 +1,3 @@
 --encrypt ${ESPTOOLPY_FLASH_PROJECT_OPTIONS}
-$<JOIN:$<TARGET_PROPERTY:flash_project_args_target,FLASH_PROJECT_ARGS>,
+$<JOIN:${FLASH_PROJECT_ARGS},
 >