chore(rootfs/Dockerfile): update golangci-lint to v1.40.1 (#289)

See https://github.com/golangci/golangci-lint/releases/tag/v1.40.1

Author: mboersma

rootfs/Dockerfile

@@ -8,7 +8,7 @@ ENV ANSIBLE_VERSION=2.10.3 \
     DOCKER_VERSION=20.10.2 \
     ETCDCTL_VERSION=v3.1.8 \
     GO_VERSION=1.16.4 \
-    GOLANGCI_LINT_VERSION=v1.39.0 \
+    GOLANGCI_LINT_VERSION=v1.40.1 \
     GOSS_VERSION=v0.3.16 \
     HELM_VERSION=3.5.4 \
     KUBECTL_VERSION=v1.18.18 \