Bump step-security/harden-runner from 2.10.2 to 2.10.3 #39

Job	Run time
Build tests	2m 31s
Build tests	2m 31s
E2E tests (k8s-oldest, read-only)	5m 3s
E2E tests (k8s-oldest, read-only)	5m 3s
Unit tests	2m 53s
Unit tests	2m 53s
E2E tests (k8s-oldest, read-write)	8m 11s
E2E tests (k8s-oldest, read-write)	8m 11s
E2E tests (k8s-plus-one, read-only)	5m 10s
E2E tests (k8s-plus-one, read-only)	5m 5s
E2E tests (k8s-plus-one, read-write)	7m 34s
E2E tests (k8s-plus-one, read-write)	7m 34s
	1h 2m 39s

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