flutter-cluster-dashboard: update SRCREV

Update SRCREV to pick up:

5bd594a Add gitlab issue/merge request templates
dbb971a Fix unit handling
da47b06 Fix TLS configuration parsing

Bug-AGL: SPEC-4474, SPEC-5045, SPEC-5046

Change-Id: I58144e22ee8a65737bf0d11c7576dfa3c29ce6eb
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-demo/+/29684
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jenkins Job builder account