fix(github-release): update fluxcd/flux2 to v2.0.0-rc.5

| datasource  | package      | from        | to          |
| ----------- | ------------ | ----------- | ----------- |
| github-tags | fluxcd/flux2 | v2.0.0-rc.4 | v2.0.0-rc.5 |

Author: renovate[bot]

kubernetes/bootstrap/kustomization.yaml

@@ -4,7 +4,7 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
-  - github.com/fluxcd/flux2/manifests/install?ref=v2.0.0-rc.4
+  - github.com/fluxcd/flux2/manifests/install?ref=v2.0.0-rc.5
 patches:
   # Remove the network policies that does not work with k3s
   - patch: |-