Add `HTTP::Cookie#expire` #13043

Job	Run time
check_format	1m 38s
x86_64-gnu-test (1.7.3)	34m 6s
x86_64-gnu-test-preview_mt	5m 38s
x86_64-gnu-test (1.8.2)	36m 5s
x86_64-musl-test	36m 16s
x86_64-gnu-test (1.9.2)	34m 21s
x86_64-gnu-test (1.10.1)	35m 40s
x86_64-gnu-test (1.11.2)	33m 35s
x86_64-gnu-test (1.12.2)	33m 38s
x86_64-gnu-test (1.13.3)	31m 28s
x86_64-gnu-test (1.14.0)	31m 59s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	31m 21s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 58s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	34m 2s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	33m 14s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	31m 48s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	33m 6s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	32m 13s
	9h 4m 6s

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