chore(deps): update docker/setup-buildx-action digest to 988b5a0 #1686

Job	Run time
386:tcp image	2m 35s
386:ssh image	2m 31s
amd64:tcp image	2m 41s
amd64:ssh image	2m 52s
arm/v6:tcp image	6m 59s
arm/v6:ssh image	6m 46s
arm/v7:tcp image	6m 9s
arm/v7:ssh image	5m 40s
arm64:tcp image	5m 40s
arm64:ssh image	5m 39s
ppc64le:tcp image	6m 3s
ppc64le:ssh image	5m 41s
docker.io:tcp-renovate-docker-setup-buildx-action-digest-e8fa7e4 manifest	15s
docker.io:ssh-renovate-docker-setup-buildx-action-digest-e8fa7e4 manifest	8s
docker.io:tcp-renovate-docker-setup-buildx-action-digest manifest	9s
docker.io:ssh-renovate-docker-setup-buildx-action-digest manifest	14s
ghcr.io:tcp-renovate-docker-setup-buildx-action-digest-e8fa7e4 manifest	5s
ghcr.io:ssh-renovate-docker-setup-buildx-action-digest-e8fa7e4 manifest	11s
ghcr.io:tcp-renovate-docker-setup-buildx-action-digest manifest	5s
ghcr.io:ssh-renovate-docker-setup-buildx-action-digest manifest	5s
	1h 0m 28s

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