Bumps workload version of grafana-agent to 0.40.4 for both amd64 and arm64.
Reasons:
This change means that grafana-agent-operator and grafana-agent-k8s-operator support the same grafana-agent workload version. Previous to this change, grafana-agent-operator's different architectures also used different workload versions (0.35.x for amd64, 0.39.x for arm64)
Bumps workload version of grafana-agent to 0.40.4 for both amd64 and arm64.
Reasons:
Testing instructions
Should be covered by existing tests. If workload deploys successfully it should be working as expected.