chore: Uses stable release of self-signed certificates #267

Job	Run time
lib-needs-publishing	2s
check-libraries / check-libraries	2s
static-analysis / static-analysis	33s
lint-report / lint-report	22s
integration-test / integration-test	36m 53s
unit-tests-with-coverage / unit-tests	24s
Publish Charm	0s
Publish Lib	0s
	38m 16s

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