Test

Make PhoneNumberPrefixSelect use the provided region #575

Job	Run time
Python 3.8 / dj32	46s
Python 3.8 / dj41	1m 38s
Python 3.8 / dj42	44s
Python 3.9 / dj32	38s
Python 3.9 / dj41	1m 20s
Python 3.9 / dj42	35s
Python 3.10 / dj32	33s
Python 3.10 / dj41	41s
Python 3.10 / dj42	41s
Python 3.10 / dj50	34s
Python 3.11 / dj32	36s
Python 3.11 / dj41	33s
Python 3.11 / dj42	43s
Python 3.11 / dj50	33s
Python 3.12 / dj32	42s
Python 3.12 / dj41	50s
Python 3.12 / dj42	1m 7s
Python 3.12 / dj50	55s
Python 3.10 / djmain	49s
Python 3.11 / djmain	44s
Python 3.12 / djmain	1m 9s
Indicate completion to coveralls.io	10s
	17m 1s

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