Move use of typing_extensions into TYPE_CHECKING block #549

Job	Run time
Unit (3.9, blacksmith-4vcpu-ubuntu-2204)	1m 40s
Unit (3.10, blacksmith-4vcpu-ubuntu-2204)	1m 25s
Unit (3.8, blacksmith-4vcpu-ubuntu-2204)	1m 27s
Unit (3.11, blacksmith-4vcpu-ubuntu-2204)	1m 34s
Unit (3.13, blacksmith-4vcpu-ubuntu-2204)	1m 47s
Unit (3.12, blacksmith-4vcpu-ubuntu-2204)	1m 25s
Integration (3.8, py-amqp, false)	1m 11s
Integration (3.8, py-redis, false)	1m 8s
Integration (3.8, py-kafka, false)	1m 56s
Integration (3.8, py-mongodb, false)	5m 15s
Integration (3.9, py-kafka, false)	2m 9s
Integration (3.9, py-amqp, false)	1m 12s
Integration (3.9, py-mongodb, false)	3m 10s
Integration (3.12, py-redis, false)	1m 13s
Integration (3.10, py-redis, false)	1m 28s
Integration (3.10, py-amqp, false)	1m 17s
Integration (3.10, py-mongodb, false)	3m 10s
Integration (3.11, py-redis, false)	2m 4s
Integration (3.11, py-mongodb, false)	3m 6s
Integration (3.13, py-amqp, false)	1m 21s
Integration (3.12, py-mongodb, false)	3m 18s
Integration (pypy3.10, py-redis, true)	1m 17s
Integration (3.10, py-kafka, false)	2m 20s
Integration (3.12, py-amqp, false)	1m 16s
Integration (3.12, py-kafka, false)	2m 0s
Integration (3.13, py-redis, false)	1m 16s
Integration (3.11, py-amqp, false)	1m 11s
Integration (pypy3.10, py-amqp, true)	1m 24s
Integration (3.11, py-kafka, false)	1m 54s
Integration (3.13, py-mongodb, false)	3m 23s
Integration (pypy3.10, py-mongodb, true)	3m 27s
Integration (3.13, py-kafka, false)	2m 12s
Integration (3.9, py-redis, false)	1m 17s
	1h 5m 13s

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