chore(deps): update fluxcd/flux2 to v2.6.3 (#156)

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

Author: renovate[bot]

clusters/common/bootstrap/flux/kustomization.yaml

@@ -4,7 +4,7 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
-  - github.com/fluxcd/flux2/manifests/install?ref=v2.6.2
+  - github.com/fluxcd/flux2/manifests/install?ref=v2.6.3
 patches:
   # Remove the default network policies
   - patch: |-