Update gemspec URIs #790

Job	Run time
Ruby memcheck	1m 6s
ruby-versions / Generate Ruby versions	2s
ubuntu-latest 2.7	1m 6s
ubuntu-latest 3.0	44s
ubuntu-latest 3.1	44s
ubuntu-latest 3.2	48s
ubuntu-latest 3.3	1m 52s
ubuntu-latest 3.4	44s
ubuntu-latest head	2m 52s
ubuntu-latest jruby	1m 17s
ubuntu-latest jruby-head	2m 19s
macos-14 2.7	51s
macos-14 3.0	24s
macos-14 3.1	26s
macos-14 3.2	21s
macos-14 3.3	25s
macos-14 3.4	28s
macos-14 head	16s
macos-14 jruby	41s
macos-14 jruby-head	45s
windows-latest 2.7	4m 37s
windows-latest 3.0	2m 23s
windows-latest 3.1	2m 34s
windows-latest 3.2	2m 5s
windows-latest 3.3	2m 42s
windows-latest 3.4	2m 37s
windows-latest head	1m 36s
ubuntu-24.04-arm 3.4	45s
macos-13 3.4	36s
windows-latest mswin	1m 17s
ubuntu-latest jruby-9.4	2m 6s
macos-latest truffleruby-head	34s
ubuntu-latest truffleruby-head	2m 26s
	44m 29s

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