Update rubygems_url to new Cinc rubygems server (#29) #150

Job	Run time
lint-unit / check-metadata	0s
lint-unit / markdownlint-cli2	4s
lint-unit / cookstyle	31s
lint-unit / markdown-link-check	12s
lint-unit / rspec	35s
lint-unit / yamllint	7s
integration (almalinux-8, default)	2m 29s
integration (almalinux-9, default)	2m 23s
integration (amazonlinux-2023, default)	1m 55s
integration (centos-stream-9, default)	2m 43s
integration (debian-11, default)	3m 11s
integration (debian-12, default)	2m 43s
integration (opensuse-leap-15, default)	4m 1s
integration (rockylinux-8, default)	2m 17s
integration (rockylinux-9, default)	2m 30s
integration (ubuntu-2004, default)	2m 57s
integration (ubuntu-2204, default)	2m 48s
integration (ubuntu-2404, default)	2m 30s
	33m 56s

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