chore(deps): update dependency fluxcd/flux2 to v0.31.3 (#376)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

cluster/bootstrap/kustomization.yaml

@@ -2,4 +2,4 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
-  - github.com/fluxcd/flux2/manifests/install?ref=v0.31.2
+  - github.com/fluxcd/flux2/manifests/install?ref=v0.31.3

cluster/flux/flux-system/flux-installation.yaml

@@ -8,7 +8,7 @@ spec:
   interval: 10m
   ref:
     # renovate: datasource=github-releases depName=fluxcd/flux2
-    tag: "v0.31.2"
+    tag: "v0.31.3"
   url: https://github.com/fluxcd/flux2
   ignore: |
     # exclude all