Switch CI to Python to v3.10 #99

Job	Run time
build (ubuntu-latest, examples/mbed-rtos-blink-baremetal)	1m 15s
build (ubuntu-latest, examples/mbed-rtos-cellular)	2m 34s
build (ubuntu-latest, examples/mbed-rtos-ethernet-tls)	2m 32s
build (ubuntu-latest, examples/zephyr-blink)	5m 43s
build (ubuntu-latest, examples/zephyr-synchronization)	5m 54s
build (windows-latest, examples/mbed-rtos-blink-baremetal)	5m 0s
build (windows-latest, examples/mbed-rtos-cellular)	11m 55s
build (windows-latest, examples/mbed-rtos-ethernet-tls)	11m 57s
build (windows-latest, examples/zephyr-blink)	11m 15s
build (windows-latest, examples/zephyr-synchronization)	11m 9s
build (macos-latest, examples/mbed-rtos-blink-baremetal)	2m 15s
build (macos-latest, examples/mbed-rtos-cellular)	5m 43s
build (macos-latest, examples/mbed-rtos-ethernet-tls)	5m 47s
build (macos-latest, examples/zephyr-blink)	6m 37s
build (macos-latest, examples/zephyr-synchronization)	6m 1s
	1h 35m 37s

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