Prefer latest toolchain-xtensa (#300) #102

Job	Run time
build (ubuntu-latest, examples/arduino-asyncudp)	2m 6s
build (ubuntu-latest, examples/arduino-blink)	3m 11s
build (ubuntu-latest, examples/arduino-webserver)	2m 16s
build (ubuntu-latest, examples/arduino-wifiscan)	2m 2s
build (ubuntu-latest, examples/esp8266-nonos-sdk-blink)	44s
build (ubuntu-latest, examples/esp8266-rtos-sdk-blink)	37s
build (windows-latest, examples/arduino-asyncudp)	3m 23s
build (windows-latest, examples/arduino-blink)	5m 5s
build (windows-latest, examples/arduino-webserver)	3m 48s
build (windows-latest, examples/arduino-wifiscan)	3m 35s
build (windows-latest, examples/esp8266-nonos-sdk-blink)	1m 47s
build (windows-latest, examples/esp8266-rtos-sdk-blink)	1m 44s
build (macos-latest, examples/arduino-asyncudp)	2m 46s
build (macos-latest, examples/arduino-blink)	4m 7s
build (macos-latest, examples/arduino-webserver)	3m 47s
build (macos-latest, examples/arduino-wifiscan)	3m 6s
build (macos-latest, examples/esp8266-nonos-sdk-blink)	1m 18s
build (macos-latest, examples/esp8266-rtos-sdk-blink)	58s
	46m 20s

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