Merge branch 'release/v4.2.1' #103

Job	Run time
build (ubuntu-latest, examples/arduino-asyncudp)	2m 1s
build (ubuntu-latest, examples/arduino-blink)	4m 5s
build (ubuntu-latest, examples/arduino-webserver)	2m 18s
build (ubuntu-latest, examples/arduino-wifiscan)	2m 28s
build (ubuntu-latest, examples/esp8266-nonos-sdk-blink)	46s
build (ubuntu-latest, examples/esp8266-rtos-sdk-blink)	44s
build (windows-latest, examples/arduino-asyncudp)	2m 59s
build (windows-latest, examples/arduino-blink)	7m 24s
build (windows-latest, examples/arduino-webserver)	3m 56s
build (windows-latest, examples/arduino-wifiscan)	3m 23s
build (windows-latest, examples/esp8266-nonos-sdk-blink)	1m 46s
build (windows-latest, examples/esp8266-rtos-sdk-blink)	1m 52s
build (macos-latest, examples/arduino-asyncudp)	2m 51s
build (macos-latest, examples/arduino-blink)	5m 20s
build (macos-latest, examples/arduino-webserver)	3m 7s
build (macos-latest, examples/arduino-wifiscan)	3m 41s
build (macos-latest, examples/esp8266-nonos-sdk-blink)	56s
build (macos-latest, examples/esp8266-rtos-sdk-blink)	1m 5s
	50m 42s

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