changes for updated esptool.py v5 (espressif#11488)

Author: Jason2866

tools/pioarduino-build.py

@@ -99,11 +99,11 @@ def generate_bootloader_image(bootloader_elf):
 "--chip",
 build_mcu,
 "elf2image",
-"--flash_mode",
+"--flash-mode",
 "${__get_board_flash_mode(__env__)}",
-"--flash_freq",
+"--flash-freq",
 "${__get_board_f_image(__env__)}",
-"--flash_size",
+"--flash-size",
 board_config.get("upload.flash_size", "4MB"),
 "-o",
 "$TARGET",