test

Update documentation URI in gemspec to point to the "https://ruby.git… #578

Job	Run time
check-misc (head)	10s
steep-check (head)	42s
test-memory (head)	36s
test-ruby (head, master)	6m 31s
test-ruby (3.0, master)	7m 34s
test-windows (head)	2m 16s
ruby-versions / Generate Ruby versions	4s
test-cpp (head, g++)	12s
test-c (head, cc)	15s
test-cpp (head, clang++)	17s
test-c (head, gcc)	15s
test (2.5)	32s
test-c (head, clang)	14s
test (2.6)	28s
test (2.7)	28s
test (3.0)	14s
test (3.1)	16s
test (3.2)	16s
test (3.3)	17s
test (3.4)	15s
test (head)	16s
	22m 8s

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