Use `Fiber.inactive` inside `Fiber#run`'s `ensure` block #9346

Job	Run time
check_format	2m 32s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	49m 51s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	40m 21s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	51m 6s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	52m 30s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	50m 14s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 9s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	48m 22s
x86_64-gnu-test (1.7.3)	41m 31s
x86_64-gnu-test (1.8.2)	47m 16s
x86_64-gnu-test (1.9.2)	43m 37s
x86_64-gnu-test-preview_mt	7m 49s
x86_64-musl-test	50m 9s
deploy_api_docs	0s
	8h 40m 27s

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