[chore] add @dmathieu to maintainers (#1433) #334

Job	Run time
Release k8s / prev-tag	6s
Release k8s / prepare (linux, s390x)	7m 17s
Release k8s / prepare (linux, arm64)	9m 9s
Release k8s / prepare (linux, amd64)	8m 41s
Release k8s / prepare (linux, ppc64le)	7m 57s
Release k8s / prepare (linux, riscv64)	8m 35s
Release k8s (Windows)	-1s
Release k8s / Release	2m 47s
Release k8s / Create GitHub issue on failed nightly release	0s
	44m 31s

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