chore: Update ghcr.io/controlplaneio-fluxcd/charts/flux-operator Docker tag to v0.31.0

Author: renovate[bot]

flux/repositories/oci/flux-operator.yml

@@ -8,5 +8,5 @@ spec:
     mediaType: application/vnd.cncf.helm.chart.content.v1.tar+gzip
     operation: copy
   ref:
-    tag: 0.30.0
+    tag: 0.31.0
   url: oci://ghcr.io/controlplaneio-fluxcd/charts/flux-operator