Update dependency fluxcd/flux2 to v2.6.4

Reviewed-on: https://git.front.kjuulh.io/clank/kubernetes-state/pulls/1

.drone.yml

@@ -0,0 +1,9 @@
+
+kind: pipeline
+type: docker
+name: "test"
+steps:
+  - name: test
+    image: harbor.front.kjuulh.io/docker-proxy/library/bash:latest
+    commands:
+      - echo 'Run tests'

renovate.json

@@ -0,0 +1,3 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+}