Point to new mailinglist at groups.io

Point to new mailinglist at groups.io

https://lists.automotivelinux.org/g/agl-dev-community  is the right url.

Bug-AGL: SPEC-3490
Signed-off-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Change-Id: Icd17b02b48cc91d6bd209a0d84809648f6e4f08f
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/24970
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-boot-test: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>