Fix json_encoders for Enum subclasses #9633

Job	Run time
lint 3.7	1m 12s
lint 3.8	1m 11s
lint 3.9	1m 13s
lint 3.10	1m 44s
lint 3.11	1m 51s
docs-build	1m 44s
test memray	6m 19s
test ubuntu / 3.7	2m 3s
test ubuntu / 3.8	2m 53s
test ubuntu / 3.9	2m 12s
test ubuntu / 3.10	2m 14s
test ubuntu / 3.11	2m 50s
test macos / 3.7	3m 26s
test macos / 3.8	3m 3s
test macos / 3.9	3m 29s
test macos / 3.10	5m 30s
test macos / 3.11	3m 21s
test windows / 3.7	3m 3s
test windows / 3.8	3m 15s
test windows / 3.9	3m 11s
test windows / 3.10	6m 4s
test windows / 3.11	3m 48s
test ubuntu / pypy3.7	9m 32s
test ubuntu / pypy3.8	7m 40s
test ubuntu / pypy3.9	7m 55s
test fastapi	2m 11s
mypy 1.0.1 / 3.10	4m 49s
mypy lockfile / 3.10	4m 24s
mypy 1.2.0 / 3.10	5m 7s
mypy 1.4.1 / 3.10	3m 30s
mypy lockfile / 3.7	4m 41s
mypy lockfile / 3.8	3m 22s
mypy lockfile / 3.9	3m 58s
mypy lockfile / 3.11	3m 25s
test typing-extensions 4.6.1 on Python 3.8	2m 47s
test typing-extensions 4.6.1 on Python 3.9	2m 38s
test typing-extensions 4.6.1 on Python 3.10	3m 34s
test typing-extensions 4.6.1 on Python 3.11	3m 33s
test typing-extensions main on Python 3.8	2m 11s
test typing-extensions main on Python 3.9	2m 34s
test typing-extensions main on Python 3.10	3m 11s
test typing-extensions main on Python 3.11	3m 6s
test typing-extensions 4.6.1 on Python 3.7	1m 38s
check	2s
coverage-combine	24s
release	0s
Send tweet	0s
	2h 31m 48s

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