unoq: restore main thread priority to 5 #755

Job	Run time
Build and package cores	9m 47s
Split off zephyr_contrib	30s
Split off zephyr_unoq	16s
Split off zephyr	19s
Split off zephyr_main	10s
Test zephyr_main:giga	2m 41s
Test zephyr_main:portentah7	2m 27s
Test zephyr:unoq	2m 22s
Test zephyr_main:niclasense	2m 28s
Test zephyr_main:opta	2m 35s
Test zephyr_contrib:ek_ra8d1	2m 28s
Test zephyr_main:nano33ble	2m 33s
Test zephyr_contrib:frdm_mcxn947	2m 28s
Test zephyr_main:portentac33	2m 40s
Test zephyr_contrib:frdm_rw612	2m 29s
Collect logs	7s
Publish jsons	30s
verify-core	0s
Publish core	0s
cleanup-artifacts	3s
	36m 53s

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