Deprecate ChannelSecurityConfigurer #7845

Job	Run time
Check Samples	6m 44s
Check for Package Tangles	2m 43s
Build (ubuntu-latest, 17) / Build	10m 46s
Build (windows-latest, 17) / Build	17m 27s
Test Against Snapshots (17, 17) / Test	9m 29s
Test Against Snapshots (21-ea, 21) / Test	9m 5s
Deploy Docs / Deploy Docs	1m 19s
Deploy Schema / Deploy Schema	1m 9s
Deploy Artifacts / Deploy Artifacts	2m 21s
Perform Release / Perform Release	0s
Send Notification	4s
	1h 1m 7s

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