Merge branch 'bugfix/esptool_version_v4.0' into 'release/v4.0'

esptool: Update esptool to latest v2.x version (backport v4.0)

See merge request espressif/esp-idf!11584
This commit is contained in:
Angus Gratton
2020-12-14 15:14:32 +08:00