fix(github-release): update flux-manifests to v2.6.2

Author: renovate[bot]

kubernetes/base/flux-system/flux-config.yaml

@@ -7,7 +7,7 @@ spec:
   interval: 10m
   url: https://github.com/fluxcd/flux2
   ref:
-    tag: v2.6.1
+    tag: v2.6.2
   ignore:
     manifests/bases/image-reflector-controller
     manifests/bases/image-automation-controller