Fix CachePeer.cc:101 "!tcp_up" assertion after cache_peer death (#1962) #119

Job	Run time
source-maintenance-tests	2m 52s
build-tests(ubuntu-22.04,gcc,default)	12m 59s
CodeQL-tests	35m 22s
build-tests(ubuntu-22.04,gcc,minimal)	6m 55s
functionality-tests	18m 6s
build-tests(ubuntu-22.04,gcc,maximus)	14m 41s
build-tests(ubuntu-22.04,clang,default)	14m 45s
build-tests(ubuntu-22.04,clang,minimal)	8m 51s
build-tests(ubuntu-22.04,clang,maximus)	17m 18s
	2h 11m 49s

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