Upgrade Python to version 3.9

[jangalda-nsc]

test-sdk-nrf: python-3.9

[NordicBuilder]

Test specification

CI/Jenkins/NRF

• Integration Platforms

CI/Jenkins/integration

Test Module	File based changes	Manually selected	West overwrite
desktop52_verification		X
test-fw-nrfconnect-apps		X
test-fw-nrfconnect-ble		X
test-fw-nrfconnect-ble_mesh		X
test-fw-nrfconnect-ble_samples		X
test-fw-nrfconnect-boot		X
test-fw-nrfconnect-chip		X
test-fw-nrfconnect-fem		X
test-fw-nrfconnect-fw-update		X
test-fw-nrfconnect-nfc		X
test-fw-nrfconnect-nrf-iot_cloud		X
test-fw-nrfconnect-nrf-iot_libmodem-nrf		X
test-fw-nrfconnect-nrf-iot_lwm2m		X
test-fw-nrfconnect-nrf-iot_mosh		X
test-fw-nrfconnect-nrf-iot_nrf_provisioning		X
test-fw-nrfconnect-nrf-iot_positioning		X
test-fw-nrfconnect-nrf-iot_samples		X
test-fw-nrfconnect-nrf-iot_serial_lte_modem		X
test-fw-nrfconnect-nrf-iot_thingy91		X
test-fw-nrfconnect-nrf-iot_zephyr_lwm2m		X
test-fw-nrfconnect-nrf_crypto		X
test-fw-nrfconnect-proprietary_esb		X
test-fw-nrfconnect-rpc		X
test-fw-nrfconnect-rs		X
test-fw-nrfconnect-tfm		X
test-fw-nrfconnect-thread		X
test-fw-nrfconnect-zigbee		X
test-sdk-audio		X
test-sdk-find-my		X
test-sdk-pmic-samples		X
test-sdk-sidewalk		X
test-sdk-wifi		X

All integration tests: added because 'CI-all-test' was added manually

Detailed information of selected test modules

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[NordicBuilder]

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[NordicBuilder]

The changes to the 'requirements-fixed.txt' have been added to this PR.
All further changes to any of the requirements file will automatically be applied as long an 👀 is present.

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