update "s6-rc" submodule - carbon-core-system - Integration repository for versioned configuration and software on Carbon

commit cebefdfb523c97931f0bcf12c9f2bfbc3b0e8fcc
parent 26940093632d40575d3c6efeb9752edeb5903c2e
Author: ccx <root@dorje.wpr.cz>
Date:   Sun,  4 Jul 2021 13:35:47 +0200

update "s6-rc" submodule

	carbon-core-system Integration repository for versioned configuration and software on Carbon
	git clone https://ccx.te2000.cz/git/carbon-core-system
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