Change base class of TimeZoneSerializerField from DJRF's Field to Cha… #381

Job	Run time
Lint	32s
Build	29s
Test py3.8, dj4.2, pytz, sqlite	1m 7s
Test py3.8, dj4.2, zoneinfo, sqlite	50s
Test py3.8, dj4.2, pytz, postgres	45s
Test py3.8, dj4.2, zoneinfo, postgres	56s
Test py3.9, dj4.2, pytz, sqlite	51s
Test py3.9, dj4.2, zoneinfo, sqlite	56s
Test py3.9, dj4.2, pytz, postgres	59s
Test py3.9, dj4.2, zoneinfo, postgres	1m 6s
Test py3.10, dj4.2, pytz, sqlite	56s
Test py3.10, dj4.2, zoneinfo, sqlite	54s
Test py3.10, dj4.2, pytz, postgres	57s
Test py3.10, dj4.2, zoneinfo, postgres	1m 3s
Test py3.10, dj5.0, zoneinfo, sqlite	51s
Test py3.10, dj5.0, zoneinfo, postgres	1m 1s
Test py3.10, dj5.1b1, zoneinfo, sqlite	51s
Test py3.10, dj5.1b1, zoneinfo, postgres	56s
Test py3.11, dj4.2, pytz, sqlite	47s
Test py3.11, dj4.2, zoneinfo, sqlite	46s
Test py3.11, dj4.2, pytz, postgres	1m 5s
Test py3.11, dj4.2, zoneinfo, postgres	52s
Test py3.11, dj5.0, zoneinfo, sqlite	50s
Test py3.11, dj5.0, zoneinfo, postgres	54s
Test py3.11, dj5.1b1, zoneinfo, sqlite	1m 6s
Test py3.11, dj5.1b1, zoneinfo, postgres	54s
Test py3.12, dj4.2, pytz, sqlite	51s
Test py3.12, dj4.2, zoneinfo, sqlite	53s
Test py3.12, dj4.2, pytz, postgres	51s
Test py3.12, dj4.2, zoneinfo, postgres	1m 9s
Test py3.12, dj5.0, zoneinfo, sqlite	53s
Test py3.12, dj5.0, zoneinfo, postgres	1m 8s
Test py3.12, dj5.1b1, zoneinfo, sqlite	1m 1s
Test py3.12, dj5.1b1, zoneinfo, postgres	1m 1s
	31m 1s

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