Update release date for 4.8.0 #300

Job	Run time
Wait-for-package-building	12m 13s
Test-install-deb-systems (ubuntu:xenial, agent, amd64)	18s
Test-install-deb-systems (ubuntu:xenial, agent, i386)	20s
Test-install-deb-systems (ubuntu:xenial, manager, amd64)	1m 27s
Test-install-deb-systems (ubuntu:bionic, agent, amd64)	22s
Test-install-deb-systems (ubuntu:bionic, agent, i386)	27s
Test-install-deb-systems (ubuntu:bionic, manager, amd64)	1m 38s
Test-install-deb-systems (ubuntu:focal, agent, amd64)	21s
Test-install-deb-systems (ubuntu:focal, agent, i386)	35s
Test-install-deb-systems (ubuntu:focal, manager, amd64)	1m 40s
Test-install-deb-systems (ubuntu:jammy, agent, amd64)	22s
Test-install-deb-systems (ubuntu:jammy, manager, amd64)	1m 28s
Test-install-deb-systems (debian:stretch, agent, amd64)	24s
Test-install-deb-systems (debian:stretch, agent, i386)	23s
Test-install-deb-systems (debian:stretch, manager, amd64)	1m 33s
Test-install-deb-systems (debian:buster, agent, amd64)	16s
Test-install-deb-systems (debian:buster, agent, i386)	20s
Test-install-deb-systems (debian:buster, manager, amd64)	1m 29s
Test-install-deb-systems (debian:bullseye, agent, amd64)	18s
Test-install-deb-systems (debian:bullseye, agent, i386)	21s
Test-install-deb-systems (debian:bullseye, manager, amd64)	1m 22s
	27m 37s

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